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| QUESTION NO. P101702-6: IBM 6547-0BN monitor has a faulty HOT SEC5088. Could not find any other faulty components, but when I replaced it, the transistor promptly blew again, what other components could be responsible? |
| What replacement did you use for your SEC5088? Proper number for replacement is KSC5088. 2SC5088 is not equivalent. |
| QUESTION NO. P111802-2: AOC 5E monitor FCC ARSCM350S. Need part number of D922. |
| This is a high failure part. Original is STPR320. It should be replaced by SUF5402 or UF302G. |
| QUESTION NO. P110602-1: Sony CPD200GST monitor Scc-L70b. Q513 s/c. After removing ( or replacing ) Q512,515 & 516 get hot with line fold over on the screen. R578 looks stressed and reads 20k. Voltages seem OK on these fets. |
| R578 is 27 ohms, 1 Watt, flameproof, in the schematic, so replace R578. Also check C573 (4.7 uF/250V) and L506 (0.47 mH), in series with R578. If this does not clear up the problem, I would check transformer T503, C504, C505, and then flyback T501. |
| Have the same monitor. Different SMPS fault though. R578 is a 27ohm resistor , not 20K. |
| QUESTION NO. P110802-8: Daytek DT-14ST39 monitor, vertical deflection IC301 burned completely, only ST (SGS-Thompson) logo visible. Multiwatt 15 package IC code number needed to get replacement (TDAxxxx). |
| The vertical IC is TDA1675A; Mouser Electronics (www.mouser.com) lists it. |
| IF the TDA is visible then the rest is likely TDA9302H or TDA8172 or TDA8176 in which case you can sub 8172 for 9302 but not the other way around. The IC is 7 pins 4 bent behind & 3 in front and (15 pin in the same configuration is TDA8176).. I don't have schematics, but have changed a few of these. There are a few single in line versions which have more pins. |
| QUESTION NO. P110802-4: Acana Advance 17S monitor FCC IIBUAI has no vertical position adjust. |
| Check transistors Q302 (NPN) and Q303 (PNP). |
| QUESTION NO. P110402-6: Sony GDM-20se1 monitor FCC ak8gdm20e01. Replaced Q511 and IC404, unit came back after 3 months. Replaced Q511 and PS001 (on crt bd), lasted for 2 weeks then Q511 blown again. |
| Check the electrolytic capacitors on the power supply board; C610, C611, C612, C614, C615, etc, etc. When these caps are marginal or have high ESR, other components become stressed. If Q511 shorted, also check Q512 (leaky?), D504, L508, and fuse PS500. |
| QUESTION NO. P110102-4: Acer 54el FCC JVP7154E monitor has no display. Replaced HOT and cap C335. Switch ON and got display but after a few minutes HOT burned again. Replaced flyback transformer but did not help. Checked others component okay. |
| If C335 was bad, it is possible that IC201 (TDA4858) was also damaged, and needs replacing; also check the value on R214 (15K). Also check components in the base drive circuit for the HOT, and check/replace C319, C320, and C326. |
| QUESTION NO. P103102-7: Apple / LG M2978 BEJCA500 m/scan 15 replaced B+ fet & 3 caps on the line but need D708 ID not a number format I have seen before K1 - 4 - 56 need values. |
| Took a chance on D708 with the only reference close to it was Sanken's RK14 40volt 1.7A schottky. Used 1N5822 with rebore, D707 is also the same located adjacent to D708. |
| I believe this is a Sanken EK14, a 40 Volt, 1.5 Amp Schottky diode. You probably can substitute an ECG/NTE 586 for that Schottky, if it is defective. |
| QUESTION NO. P110502-9: HP ultra VGA 1024 monitor model D2825 FCC JVP7154E Hitachi chassis blinks on and off after five minute warm up. When this happens the select buttons do not work. The last mode LED selected will stay on. |
| Replace the small ceramic disk capacitor C335 (220 pF/2KV), located near the yoke connector. Sometimes this is all that is needed. Use a good-quality capacitor; a 3KV rating is best. Mouser Electronics (www.mouser.com) is one source. If R214 (15K) is suspect, replace R214 and check IC201 (TDA4858), as well. Also check for bad solder in this area. This HP is an Acer chassis, not a Hitachi chassis. |
| QUESTION NO. P110402-2: Gateway CS1572FS monitor, video looks good, but picture icons smear to the right leaving a light tail on the screen. |
| The CRT may have gone bad; this is especially likely when a Toshiba CRT is installed. If the CRT installed is a Hitachi, you might try changing all the 1 uF electrolytic capacitors (both polarized and bipolars) on the CRT board, and also checking C332. |
| Check the caps on the crt board. Bad or low esr will cause this condition. If all caps are good, try attaching a ferrite core around one or both ends of the video cable if no so equipped. |
| QUESTION NO. P110402-4: Mag 570v monitor with transistor or FET shorted, FS12KM5, was wondering if there is a suitable cross for this. Have not been able to locate a source for this part. |
| FS12KM-5 is a Mitsubishi N-channel Mosfet, rated for 250 Volts, with Rds[on] < 0.4 ohm. FS12KMA-5A is a possible substitute; also, IRFI644G, which is listed by Digikey (www.digikey.com) and Nationwide (www.neiparts.com); Hitachi's 2SK1762, listed by B&D Enterprises (www.bdent.com), and Hitachi's 2SK2426. |
| QUESTION NO. P103102-1: Compaq 623t monitor FCC br8sm-769a. Replaced faulty fbt. Now have very narrow vert line from top to bottom. Checked most components in horiz stage. |
| R866 and R534 both 2.2 ohms 1/4 Watt both carry about 192 Volts from power supply, R866 to fbt and R 534 to yoke driver. The yoke driver's 192 volts is cut off with R 534 open, that is why you have a narrow vertical line. Also check C 860 and C533 both are 33uF 250 volt caps, especially in this case where R534 is on same circuit as C533. |
| The FBT is driven by Q831, but Q803 drives the horizontal yoke. Q803 might be bad, or lack B+ on its collector, or its base drive may be missing. The horizontal yoke itself may also be open, or have bad solder connections. |
| QUESTION NO. P103002-2: Medion 1772IE monitor. Need values of R329 and R356, these have blown and are unreadable. |
| Believe your monitor will revert to an Acer 7276E where R329 is 10K and R 356 is 47K if it has an FCC ID of JVP7276E that will be it. The schematic is available on the Russian and CZ sites or try FTP 24.197.70.237. |
| QUESTION NO. P110102-8: Radius 0381 monitor, the original fault was no H scan due to PS101 being O/C. Now it does not lock horizontally unless H-Freq pot adjusted to one end and then only at 48kHz or above. The LED's on front status are all lit except for Brightness led. |
| Answering the fault myself for the LED's, it was in service mode, a switch inside. |
| QUESTION NO. P103102-3: Viewsonic 21PS monitor with no heater voltage. I traced continuity back as far as I can into the power supply area. |
| This chassis has a common problem, with C867 going bad, leaking fluid, and eating the PCB traces under it, on the top-side of the board. Pull the C867, and if any leakage or corrosion is seen, clean well; if the heater PCB trace underneath C867 is damaged, jumper it. Also, C839 gets this fluid leakage, as well; so it's a good idea to check it also. |
| QUESTION NO. P102802-10: Dell ultrascan P1110 monitor with an excessive brightness/raster with slight color purity problem. Fault seems to be on small logic board situated on the base of the monitor and I am am unable to pinpoint the fault. The board has a Sony ic, I changed the whole board to cure the fault short term, but I am seeing more monitors like this. There are no adjustments other than focus. |
| This Dell is like the Sony G1-chassis types, and it sounds like it needs a Sony DAS (software) alignment, which can adjust the G2 voltage (assuming yours is excessive), as well as adjusting the white balance. |
| QUESTION NO. P102102-3: Compaq 462 monitor has no brightness control. I measure -28v on one side of the Brightness pot, and -10v on the other side. G1 measures -150v, and not changing with the brightness pot. |
| If this is the model I recall the screen being over bright with no adj, turned out to be 2.2 ohm resistor on the video board. There are three all up half watt. |
| QUESTION NO. P102902-4: Panasonic Panasync S110 monitor Chassis HV10S has no display. B+ is normal, Yoke drive OK. No drive to flyback and no output from IC671. |
| Review Question number P60602-5. Also check J114 which on this model may be 800mA microfuse or as the S110i has Q861 is the same thing on the 185V rail. Check Q881, Q549 & R890 also review Question P311-4. |
| The flyback transformer (TLFA01365) is very high failure in this chassis. Check out the flyback's internal capacitors, from the HV anode to pin 14, and to pin 15. If the capacitor to pin 15, that gives HV feedback for IC671, goes leaky/shorted, the output from IC671 can become reduced, to very narrow spikes, or shut off. Also check if IC671 is now bad. |
| QUESTION NO. P102802-9: Sony GDM-400PS monitor. Have reviewed Q P54-3 and others, I suspect IC007 (CXA2043Q) but need confirmation of symptoms, picture rolling vertically with pin moving in and out as scrolling, squashed slightly at top but full screen and all adjustments appear to work, looks like stuck in adjustment loop. The manual I have does not show the IC007 voltages, other main components check OK. The no input message after signal down is OK and self test steady picture, but OSD when signal applied goes haywire with the rest, are we looking at IC007? |
| A defective IC007 can give a range of geometry-related symptoms, and yours are among them. For instance, distorted/squashed display, scalloped sides, jitter, unstable raster or scrolling, and the adjustments often still function. However, since IC007 is pricey, and its PCB traces are delicate, you might wish to first check C712 and R728, off IC702, in case one of those components is bad. |
| QUESTION NO. P100202-10: NEC MultuSync 95 monitor had initially dead HOT and fusible resistor. After replacing them HV first reaches about 15 kV then switches off. HV and H outputs from processor tda 9111 disappear. Looks like X-ray protection, but Vcc for processor is only 10 volts (should be more than 10.8). Replacing of processor doesn't help. |
| Check that the value of R155 (0.22 ohm) is exact. |
| QUESTION NO. P102102-5: Mitsubishi DiamondView 1554 monitor, when switched on, light next to switch is blinking with ticking sound. C335 is blown, what value is it? |
| My notes say C335 is 220 pF/2KV.. |
| QUESTION NO. P102102-6: Gateway monitor EV900-70000595 Model X19001 has no high voltage. Power supply is ok but no b+ to collector of horizontal out transistor Q112. Q112 is fine. There is 200v on drain of MOSFET Q107. There is a hissing noise from power transformer. |
| First, if the power LED is green, resolder all legs of L501. If no help, check D315 in the power supply secondary, FET Q107, and the flyback transformer. If the FBT is bad, check whether any resistors in the ABL circuitry have burned. |
| QUESTION NO. P102102-7: AppleVision 850 monitor has no picture or CRT illumination and no on-screen controls when adjusting front panel buttons. Monitor reacts normally when connected to CPU including degauss and power switch LED color change from orange to green. |
| Does the monitor also have high voltage come up on the CRT? If the monitor lacks HV to the CRT, there is probably a hardware fault. Try checking RL163 (4.7 ohm, fusible), QL2, QL23, and check solder joints nearby these components and on the horizontal yoke connector. If HV is present, after all, the internal memory settings may be corrupted. These can be restored, using an ADB-type Power Macintosh computer (ADB cable must be attached), if that Mac has in its System folder, an °Applevision Extension of version 1.5.3 or later (roughly, Mac OS 8.5 or so). Do a boot-up of the computer from power-off, with both video & ADB cables attached to the monitor, while holding down these four keys, Command(Apple)-Option(Alt)-A-V. Continue to press all four keys for the few minutes it takes to complete the boot-up. |
| QUESTION NO. P92402-9: Acer 7277C monitor with the Horizontal Size control and Pincushion not working, all the other geometry controls are working perfectly, and it has R334 burned, don’t know the value. |
| R334 is 22k 1/4W. That problem is related +B generator, replace the C323 (33U X 250V). Normally that is it. |
| QUESTION NO. P101102-1: HP A4033A monitor the amber power save LED and the green POWER LED blink and the GEOM LED is solid. Found a faulty 560uf/400v electrolytic cap in the POWER Supply Unit. Replaced a working PS unit, the symptom remains the same. The components ( except opamp TL082 and Logic IC 4049 ) listed in question P414-7 and P210-1 have been cold-checked and found okay. |
| Since the P/S swap was no help, try replacing IC801 = 4049B logic IC, and check the fuses PS500 (SOC1600 = 1.6 Amp) and PS501. If no help, check if the flyback rings bad. If a new FBT is needed, see if Electronix has 8-598-929-00 in stock, before resorting to Sony. |
| QUESTION NO. P101102-2: KDS VS-7 monitor FCC evokd-1730 had a blown fuse. I replaced the transistor and fuse which gave me the start up voltage but the high voltage did not come on. I found the HOT shorted, when I replaced it I noticed some resistors getting hot. I removed power and checked the board more closely and found R-901, R-902, and R-904 burned beyond recognition. Also, ZD - 901 did not read like I thought it should. I did not find anything else that seemed to be bad. |
| The flyback is defective, and must be replaced, or it will burn those resistors again. The FBT# KFS61411A should work; Nationwide (www.neiparts.com) is one source. R901 = 27K; R902 = 12K; R904 = 12K. Since R904 burned, suspect IC401 may also be bad. |
| QUESTION NO. P101102-3: Nokia 447e monitor dead. Replaced t24 (irf9622), now there is a wide vertical line. Checked fm2529 6331 it shows 3.7 ohm (it's a coil after all). |
| Check the value of R224 (0.47 ohm). Check several tiny SMD transistors, locations like T60, T65, etc, near the flyback. They are marked 3F or G3F, and are BC857, PNP types. Inductor M3 usually will have shorts between some of its windings, if it is bad. |
| QUESTION NO. P101102-4: Apple Macintosh M3502 monitor. I need the value and power rating for R113 located on horizontal power deflection circuitry. The resistor is burned and transistor V104 is shorted. |
| R113 = 10 ohm/3 Watts. Also check the 2KV polypropylene capacitors, C108 = 0.011 uF and C106 = 0.0056 uF; R102 = 12 ohm; R109 = 22 ohm; R122 = 2.2 ohm; V105 & V106 = MUR8100E. |
| QUESTION NO. P101102-7: Panasonic Panasync S110i Chassis 21HV12S Model TX-D1F64MA monitor. Has vertical white line signal ok, yoke ok came in with shorted h/def transistor Q555 (2SC5423), used 2SC5047 problem remains. Have reviewed questions P311-4, P61402-7 & P60602-5, very similar in most cases but not exactly the same. Secondary voltages ok. Suspecting D606 Sanken RP1HN special build reads high impedance, is this correct or going in wrong direction? Q881, Q549 & R890 are also ok. |
| Beware of false board numbering. Q861 is not a transistor but an 800mA semi-fuse, after replacing this the 185 volt rail was restored and works fine with 2SC5047 a little bigger physically but angle the 6.8 ohm resistor to fit. |
| A Sanken RP1H is a 2KV diode, and its forward voltage is 6 to 7 volts, so many meters will read it as open-circuit in the forward direction. First, check the P/S secondary, on the 185 Volt supply, and see if either R861 (0.33 Ohm, 1/2W), or the microfuse at location Q861 (TO-92 case, UN11008 = 0.8 Amp fuse), are open. If the 185 Volts gets to Q881, after all, see if Q881 has gate drive. If no, check IC850. If Q881 is getting gate drive, and providing B+ voltage to the collector of Q555, after all, see if Q555's base has horizontal drive from IC580, via Q549; also check R554, D555. |
| QUESTION NO. P100402-4: Gateway monitor EV500B - White raster with flyback lines on screen. |
| Suspect no voltage to the tube cathodes which is an 150V line derived in the power supply via D922 and Q924. |
| QUESTION NO. P90402-6: Gateway EV900 monitor. Initially R573 and VR501 burned. I replaced them and D315. Now, R539 is burned and I need the value. |
| On a similar Mag chassis, R539 is 3.9K ohms. When these components burn, the flyback is defective and must first be replaced, or they will burn again. |
| QUESTION NO. P100202-8: Acana Professional 165p monitor FCC IIB TC1 shuts down if any of the front buttons are pressed. |
| The Eeprom, U602, may need replacing. If a pre-programmed chip is not accessible, try rv6llh.rsuh.ru/flesh/081001/tvm-as5s(93lc66).zip for program information. If replacing U602 is no help, the processor U601 may need replacing. |
| QUESTION NO. P100302-1: Sony CPD-200SX monitor shuts down after several hours of use, then cycles on and off, hear relays clicking with on off cycling. Cooling with fan used to extend use time, but is no longer effective. Visual inspection hasn't revealed any loose connections or burned parts. |
| There may be bad/intermittent solder joints on the main board, that need reflowing. Start nearby the microprocessor. Tapping/flexing the board may give a clue. Also, the 3842 chip (IC901, KA3842) is high failure in this chassis, and perhaps yours has become marginal. Try freeze spray on it, or replacing it with another 3842. |
| QUESTION NO. P100302-2: IBM 6558-03/U monitor made by Sony displays only lower half which shakes or is very wavy. Changed vertical IC, did not help. |
| The common cause of such symptoms in the Sony N3 chassis is a defective IC007, CXA2043Q, Sony p/n# 8-752-078-46. |
| QUESTION NO. P100202-2: Acer 54el monitor FCC JVP7154E. Checked Q317 (F2161) shorted and replaced for a new one but after switching ON, got display and after a few seconds the Q317 burned again. Checked other component is ok. |
| First, check that L304 is not shorted/burnt, or rings badly, and retains over 0.6 mH of inductance; if no, replace L304. Also check D316, D317, Q310, R214 (15K), C326, and disk cap C335 (220 pF/2KV). If C335 is at all suspicious, just replace it. If R214 is bad, also check IC201. Finally, if the above are all OK, check the flyback for shorted windings. |
| QUESTION NO. P100202-7: NEC V920 Monitor. Need Flyback VCC resistor value (R31A) color not recognizable looks like 0.--?? ohms 1 watt fusible, silver middle code only readable. |
| R31A is 0.33 ohms fusible (flameproof) 1 watt. Also replace caps and resistors on FBT supply back to secondary p/s especially 0.22 ohms 2w will be partially open. |
| In NEC chassis# N9902, R31A is 0.33 ohm. |
| QUESTION NO. P100102-2: Sony CPD-200GS monitor had a too low filament voltage because of a bad electrolytic capacitor. Now the top edge of the image is bowed upwards (about 1/4" at the center). The bottom edge is straight. How do I adjust this? There are no user adjustments for this on the front panel. |
| Clean any pots on the adjustment board on top of the yoke. Also, check around the yoke for a piece of metal (possibly cut off a component that you replaced) that may be stuck to the yoke through magnetism. If there is a small metallic object near or on the yoke, it will disrupt the magnetic field around the yoke, thus causing an anomaly in your deflection geometry. You may also have an internal short in the yoke itself. |
| QUESTION NO. P91702-5: We have a batch of HP D2826 monitors FCC A3KM079 we are refurbing. All have either low brightness/contrast problems or micro control (digital screen control) not working properly or erratic. These monitors appear to be made by Philips. The brightness can seem to be corrected by bumping up the screen master brightness adjustment on the FBT but it seems not to help the contrast range much and washes out the color some. These are fairly new units that were not used much so tube deterioration is not likely. As for the screen controls (size, width, etc.) we have no idea. |
| Replace the blue 3-pin crystal that controls the microprocessor. Common fault. To activate service menu hold in the Select button when turning on. |
| QUESTION NO. P92602-2: Proview Technology 772 (200-100-pr98e) monitor. Original problem was Q502 mosfet, R521, R520, ZD502 burnt or open. Replaced Q502, resisters,18v zener and IC502 KA3842D. No when unit is plugged in a ticking sound can be heard. VCC to IC502 varies from 11vdc to 14vdc the ticking sound is about every half second to second. Checked ac output from transformer T501 secondary and the 55vdc pin 9 is at least 75vac and dc from top of c527 is 2vdc pulses in synchronize with ac pulses from transformer. Keep in mind the set cannot be turned on at unless c527 is removed. If removed too long it will take out next cap in line (C527). I have found a mistake in CKT prints, R605 is not 1.2 k ohms it is actually 10k ohms 5%. What should be the time duration of the ac pulse when the set is just plugged in not turned on? There is no brown glue around FBT or any other ckt. The only glue used is a white silicone type on some components. |
| The rapid ticking and voltage cycling suggests an overload or short somewhere, possibly on the 55V supply. Since C527 is on the 55V supply,. Check if D508 is leaky or shorted. Also, Q630 is fed from that supply, so check if Q630 is leaky/shorted, as well. If Q630 is bad, also check L603, and replace D632 and C635. |
| QUESTION NO. P92602-3: I need an equivalent or the manufacturer of a Targa AT897D ("product name" TM4296-1). |
| This monitor is an Actebis brand. If it has an FCC ID Number, you can find it from the following URL just type in first 3 characters. http//www.fcc.gov/oet/fccid/. The following URL has a spec for the monitor http//www.targa.be/fra/monit04.htm. |
| I believe this is equivalent to the Amtran AT897D, FCC# MDZAT897, marketed by Amtran Technology (Taiwan) under several brand names. If there is no FCC number on the label, another clue is, the boards in Amtran chassis use an extra letter in their location designators, unlike most manufacturers. For example, ICA01 (an IC), CG31 (a capacitor), RG22 (a resistor), DH08 (a rectifier), QH05 (a transistor), etc. |
| QUESTION NO. P90302-8: The image size of Tektronix TX-D1F63R monitor (Chassis Panasonic 21HV10S) is too big to fit screen as a sudden event. An adjustment via OCD is not possible (range too small). Image is relatively sharp and clear at slightly decreased brightness. |
| You should be looking for a coil that has changed in value, or the center core has dropped to the bottom of of the coil. |
| QUESTION No. P91902-7: JD144K monitor has no image. Flyback produces an acute sound, burns the resistor R441 (1K). Flyback measures OK. HOT is Ok. The resistor connected R441 this to leg 7 of flyback, this leg does not have continuity with any of the other exits of flyback. |
| When R441 burns, the cause is usually a defective flyback. Often, the usual flyback measurements will not detect this kind of fault. Pin 7 should not exhibit continuity to any other pins, due to isolation by the internal rectifiers. |
| QUESTION NO. P83002-5: Relisys TE 770 monitor. When switching on power the indicator keeps on blinking (power LED). Replaced shorted Q951 (IRFS 630) and within a few minutes it blows again. |
| There is a high-voltage (200V-250V) electrolytic capacitor, connecting off of FET Q951. Check this capacitor, it is probably the culprit that is damaging Q951. Also check the associated rectifier for damage, as well. |
| QUESTION NO. P90402-2: Viewsonic 17PS Model 1786PS monitor. I need the part number for R802 which is burnt. Looks like a varistor. |
| I don't have the part number. However, I can give you the marking on the MOV (R802) if yours is burnt too badly and you can't read it. First line is "120", 2nd line is "M" logo (Motorola, it could more likely be Meritek) followed by "6N22", 3rd line is "17". |
| I just took apart such a monitor and found that the 120-6N22-17 part was rather well burnt. After comparing the M logo to this website http//www.elnec.com/ic_logos/ic_logos.htm#M which lists IC manufacturers and their logos (a very handy bookmark), I determined that the part is made by Matsushita. Apparently these MOVs work as surge protectors, but if they get hit with too many surges they fail. |
| I believe this part is an NTC ( Negative Temperature Coefficient ) Resistor. Otherwise known as a Inrush Current Limiter, it is used to limit peak current in the AC/DC switching power supply when the monitor is 1st powered up. http//info.digikey.com/T023/V5/SectF.pdf Page 23. Don't know which specific one is a match. |
| QUESTION NO. P91702-9: Samsung CMH 7379L monitor. Need value of Q405. |
| Q405 is VN0606M, a small logic-level N-channel Mosfet (TO-237 case). The VN0606M itself is listed by LJ Enterprises (www.ljent.com) and by Nationwide (www.neiparts.com). Also, Digikey (www.digikey.com) lists two Zetex Mosfets, ZVN4306A and ZVN4206A, that might substitute, despite their having TO-92 style cases. |
| QUESTION NO. P91602-7: Proview 770M monitor, changed burned Q630 and number of other components. Picture is too wide and pincushion at maximum (corners further away from center). H-size, pincushion and trapezoid are unadjustable. |
| Not sure of board ID number but you will find a feed diode next to flyback towards middle of board standing vertically on a heat sink. It will either be short or leaky. If not check the free standing transistors close by. |
| QUESTION NO. P91602-1: Mitsubishi Diamond View (1772E) monitor FCC JVP7276E with a fault that is shown in the archives where the resolution is mentioned as being "The usual cause is a bad C327 = 220pF/2KV. This fault can also damage HOT Q302, Q301, IC201 = TDA4858, ZD210 = 5.1V zener, R326 = 3.9K, R328 = 4.7K, R329 = 10K, J013 (3 Amp microfuse)". I replaced all of these except Q301. I cannot locate what it is in my equivalence books. I used the first NPN transistor I found and the screen fired up but the PSU made a squealing noise that is affected by width (ie goes away past the outter limits of screen or when shrunk to a certain size or smaller). I found a shorted 4.7ohm R304 and when replaced the PSU goes quiet but the left of the pic is in the centre of screen with some wrap around and the OSD is much smaller and squashed into the top left 1/4 of screen which turns into garbage if you try and adjust anything using it. Also HOT Q302 gets really hot. All I can think of is Q301 needs to be specific. |
| First, the Acer schematic shows R304 as 0.47 ohms, 1 Watt, not 4.7 ohms. Your 4.7 ohm replacement possibly has caused Q302 to overheat, due to poor base drive. The usual Q301 is a FET, BSS89, not an NPN, although on many Acer boards, the Q301 lead locations are mis-marked, as "BCE", despite it's being a FET. Some substitutes for BSS89 are BSN254 or ZVN4424C. Also, a BSN254A or ZVN4424A (pinouts SGD instead of SDG) could work, if their leads are re-arranged. Nationwide (www.neiparts.com) lists BSS89 and BSN254A. Digikey (www.digikey.com) lists ZVN4424A. |
| QUESTION NO. P91002-3: Mag DX1595 monitor IAWDX15FG, the picture is too wide in vga mode (text mode, 640x480 60Hz etc.) and expanded in the center. All adjustments work but when width is adjusted to minimum the picture is still too wide. Checked the board for dry joints etc. Other modes work fine. |
| Check S-Correction Capacitors & Fets plus Fet Drive. |
| QUESTION NO. P91002-6: Nokia 447Xi monitor, FCC IEY447K had short circuit in HOT T602 (=BUH1215). What else could be broken? |
| Check also T601=IRF9540, T615=2SJ306, R639=0,56ohm/0,5watt flameproof and smd components from the other side of the pcb nearby T601. |
| QUESTION NO. P91102-1: Need a type or value for Q302 and ZD301 in a AST 7L monitor. |
| It sounds like this AST 7L is the Capetronics, not the Samsung, chassis version. In the Capetronics chassis, Q302 is IRF630 and ZD301 is a 15 Volt zener. Often, bad connections on D303 cause such failures, so resolder D303, and add an extension wire to its lead, if the lead doesn't reach all the way through the PC board. |
| QUESTION NO. P91002-7: Fujitsu 772M monitor. I need the value for R634 and D634. |
| In the similar EMC/Proview FCC# IJE772 chassis, R634 is 22 ohm, and D634 is a 1N4148 signal diode. With these components bad, I would also replace superfast rectifier D632, the FET Q630, and C635. |
| QUESTION NO. P90402-4: Viewsonic g790 monitor is dead. I read 0 volts between source and gate of FS10KM-6 power MOSFET but I read 170 V between source and drain. |
| Check supply voltage to IC901 pin 5 0V pin 7 above 17V to start stay above 12V to keep working. If supply missing check R903 & R904. If these are OK, check that Q903 has not fired it is an SCR with zener on gate to Pin 7. If the voltage on pin 7 is pulsing check for shorts/overloads. |
| QUESTION NO. P82202-8: Philips monitor CM0700 A3KM043 in Apple 14 AV has a small slot image in center of screen 6 inches wide 1/4 inch high. Flyback OK, vert IC OK, HOT OK, changed caps, 2 x 1 ohm resistors & 1 x 4.7k half watt. HOT running too hot and darlington transistor on same heat sink very hot. Going into shutdown when signal applied. Have swapped good flyback no effect. |
| The cause was a totally open tube connections, replaced with new tube and unit works perfectly. Items replaced were; 7916-IRF620 or equivalent,3915-4.7kohms half watt 3637-1ohm half watt, 3152-1ohm half watt, flyback is HR46126 (Diemen)and the tube to suspect is Philips M34EDC13X. |
| QUESTION NO. P82102-1: Compaq V500 monitor that I had to change the CRT, now I need to adjust the colors. How do I get into the service mode. |
| This unit is made by Samsung. You need the Samsung version of DAS software and interface to re-adjust. |
| QUESTION NO. P83002-3: HP-2842A Monitor LG p/n 6870T210A10. I need the part number of IC 903 in the power supply section. |
| If your HP is LG chassis CA-64, or is FCC# BEJCB910, it is similar to a LG Studioworks 910SC, in which IC903 is TOP223Y, LG part code# 0IPF223000A. Aside from LG distributors, LJ Enterprises (www.ljecc.com), lists TOP223Y, on-line, in the US. |
| QUESTION NO. P83002-7 Samsung 400nb monitor chassis cka4217, IC602 (KA2H0880) has a short between VCC and GROUND. I need info and sub for this IC. |
| KA2H0880 is Samsung regulator IC; a Samsung distributor may list this IC, as Samsung part# BH13-10334H. For a substitute, you could try KA2S0880. In North America, KA2S0880 is listed on-line by LJ Enterprises (www.ljecc.com) and Nationwide (www.neiparts.com), among others. |
| QUESTION NO. P73002-6: Samsung NB 400 monitor, when shutting off it decays too slow causing a burn spot on the phospher in the middle of the screen. I thing is a CI ka2s0880. |
| KA2H0880 is Samsung regulator IC; a Samsung distributor may list this IC, as Samsung part# BH13-10334H. For a substitute, you could try KA2S0880. In North America, KA2S0880 is listed on-line by LJ Enterprises (www.ljecc.com) and Nationwide (www.neiparts.com), among others. |
| QUESTION NO. P82802-5: Viewmaster KFC CA1515DS monitor. Need value of R138 near FBT fried due to bad joint on flyback reads 7.5 ohms. |
| R136 is 10kohms half watt. |
| QUESTION NO. P82802-1: Sun GDM-5010PT monitor FCC AK8GDM500PS. The picture distorts on upper side, when I adjust it with trapezoid control, it suddenly change the distortion to the lower side. It happens same when adjust pincushion and vertical height. The H. size and position adjustment are ok. I re-soldered deflection board but no help. |
| A defective IC007 = CXA2043Q is the usual cause of this fault. Change that chip. |
| QUESTION NO. P82202-4: Samsung400nb monitor, chassis cka 4217, is dead and the power LED is not lit. I took measurements with tester and there is tension in C617, primary transformer T601 but the rest of the circuit has no volts. The relay does not turn on because there is no supply on the Q601, the device TH601 seems to be in short because there are 0 volts among their pins. I replaced burst photocoupler OPT601. |
| Check to see if the power supply chip IC602 has supply to pin 3. If not check R616. |
| A burst photocoupler implies a serious overvoltage problem. Since this device couples to both primary and secondary sides of the circuit, any overvoltage might have come from either side. If from the primary side, probably IC602 has shorted, and needs replacing. If so, also check zener D603 for damage, and check components connecting to the photocoupler. If the overvoltage came from the secondary side, I would first check T601 for shorted windings, and then check components on the +13V supply, from pin 13 of T601, leading up to the photocoupler. Also, IC601, and possibly IC604, may need replacing, and check that the values of resistors R605 and R609 are not off. It is normal, for the "TH" device to have hardly any voltage across its pins. |
| QUESTION NO. P82802-8: Compaq 1210 model PE1041 monitor. I need the part number and source for IC902 (STRF6676). |
| http//www.donberg.ie/descript/s/strf6676.htm. |
| STRF6676 (or STR-F6676) is a Sanken regulator IC, rated for up to 900 Volts. This IC is listed on-line, by Dalbani in the US (www.dalbani.com), in Europe by Donberg (www.donberg.ie), and in Japan (www.tohri.co.jp). |
| QUESTION NO. P82802-4: Gateway EV700 monitor, the DC voltage on the HOT collector varies from 75 -5 volts. The flyback pulse small with lots of ringing. The base pulse comes up then shuts down and repeats every 3 seconds. Also the pulse regulator 160, and 70 volt lines, are down to 85 and 41 volts respectively. I replaced the HOT transistor, no change. When the collector of the HOT is removed, the B+ to the HOT goes to 159 volts. The 160 and 70 volt rise to normal. But the base drive still comes up then shuts down and repeats every 3 second. |
| Check any diodes connected to the FBT & the circuits they feed. Run unit with B+ disconnected & feed 30V into B+ pin of FBT must have capacitor to Gnd on your psu O/P. You can now run unit and look at wave form on collector if you have ringing desolder any supplies provided by FBT ie G1 etc and anode cap but place away from unit and in an insulating holder, if collector is still ringing then FBT is duff this monitor is made by LG and has a history of FBT failure. |
| Gateway model EV700 uses many different chassis, including LG chassis codes CA-38, CA-48, CA-65, and several Mag chassis, as well; you need its FCC or chassis code to pinpoint it. But, if yours has 160V and 70V rails, I suspect it is LG chassis CA-65, FCC# BEJCB775B. If so, a bad flyback (LG 6174Z-1012 type) is common. You may need to change the fly. Though a less frequent fault, since they are cheaper than a fly, you might first check if 12V and 5V regulator IC's, IC925 & IC923, are failing under load. |
| QUESTION NO. P82802-3: Compaq V75 model 624T monitor ticks once for a while, and more when turned on longer time. The picture will disappear for one or two second when it ticks. I checked and re-soldered main PCB and no help. The ticking sound likes a soft spark noise. |
| That is the FBT breaking down internally, very common on these units. |
| QUESTION NO. P80202-10: Gateway EV700 monitor using an LG chassis, the screen is fine except for ghosting, there is no horizontal jitter, just perfect ghosting like 3D effect to the right of each character. I checked the video amplifier and components around it. |
| With what you are saying it is not ghosting it is ringing so you should be looking at the flyback transformer damping. It will be difficult unless you can scope all the lines for a stray pulse. Look for open resistors and capacitors in the line drive and output. |
| To answer my own question, it turns out that the cable was at fault, I used an extension cable which seems to work well normally but with some monitors including this one it seems that a good quality cable is required. |
| QUESTION NO. P72302-3: Apple M4868 monitor. Customer says after a half hour picture gets blurry with a line thru it. What I see is a light horizontal bar 1/4 in. wide across the middle, and the horizontal convergence goes out slightly on the lower half only. I checked caps and other components in the convergence section and replaced the vert. IC with no luck. When I turn up the screen there is about two inches of retrace lines at the top that are brighter than the rest of the screen. They have color separation also when everything goes bad. The problem shows up in under a minute from a cold turn on. |
| Check secondary p/s caps, had similar on LG / Apple M4436. Replaced C952 10uF 100volts, this one had good 640x480 but on 800x600 showed the lines you mention when hot would appear all resolutions. |
| QUESTION NO. P72502-7: Gateway 2000 CS1776LE monitor FCC IAWDX17F. I need the values of C170, Q117 and R193. |
| If the components mentioned are merely missing from the board, and a jumper wire had been installed between the C and E positions for Q117, then this chassis received Mag's factory modification, done in later production runs, which eliminated Q117, C170, R193, as well as D121, D122, D123, and added that jumper. This modification can be done to the original boards, if those components are bad, obviating the need for their values; also check the usual problem items, like L105, C120, C123, and R177. |
| QUESTION NO. P72402-3: Viewsonic 17gs FCC gs933008 monitor is slow to get vertical deflection when first turned on, but otherwise works fine when in 640x480 @ 60hz. Switching to 800x600 @ 75hz and it loses vertical deflection altogether, then at 1024x768 @ 60hz, it works again, but picture is shaky. |
| Check/replace the capacitors on the CRT board, especially C215 and C212. |
| QUESTION NO. P72402-5: Diamond view 1772e monitor (aka Acer 7276e I think). Both the boards in the monitor are Acer branded. The picture on the left hand side of the screen shakes from left to right quickly, intermittent fault. |
| If it's like the Acer 76e, replace (don't check) disk cap C327. In the Acer 76e, its value is 220 pF/2KV. A 3KV-rated, and a high-quality dielectric type (X7R or Y5P), are best. After that, re-flow generally for bad solder; don't miss checking C312, T303, and R347. |
| QUESTION NO. P73102-7: Applevision 1710 monitor. I need the value of RP49. |
| RP49 is smps start up ptc thermister which if ok should read 4.8 to 5.4 kohms at room temperature. |
| QUESTION NO. P71702-10: Viewsonic e771 monitor has no power. Replaced shorted Q406. |
| Transistor Q406 is used for Hor centre so it only creates a small DC shift in the line stage. As it is fairly well buffered, for it to short suggests a major failure in the horizontal stage, I would check the flyback. |
| QUESTION NO. P80802-1: HP A4331D monitor with Sony Trinitron Tube. When cold everything works fine but after warming up the picture starts shaking slightly vertically. |
| Replace IC913 = TDA9102C, on the N board; it has likely become thermal. |
| QUESTION NO. P80802-6: Compaq V70 model 621 monitor FCC A3LCGL777. I need the value of R632. Is "Samsung CGL777" correct model name, or it is better known as other one? |
| This Compaq is similar to a Samsung SyncMaster 700P, CGH7609T, FCC#A3LCGL777. I believe R632 is a 10 ohm fusible type. Also check/replace Q639, R617, and C641. |
| QUESTION NO. P80802-9: HP D2835 monitor. Looking for a cross for the vertical driver, number on part is C5088. |
| C5088 is KSC5088, not the same specs has 2SC5088. You can get this from LJ Enterprises. |
| KSC5088 (Samsung) is the full number. In this chassis, substituting 2SC4924 for KSC5088 has worked, in the past. Also be sure to check/replace electrolytic C414. |
| HP can be made by several manufacturers. I presume C5088 is a transistor which suggests a 2SC5088, this though is a surface mount high frequency device working at UHF frequencies. Only other would be if Samsung and its KSC5088 an in house number of unknown specs. |
| QUESTION NO. P80502-7: Proview PS-560 monitor, FCC IJE-564. Looking for the value of D625. |
| The schematic for FCC# IJE-564 shows D625 as 1N4148. |
| QUESTION NO. P80702-1: Proview 770m monitor. I need the value of r672 as it is cooked. |
| Proview model numbers are ambiguous, but if your unit is FCC# IJE770, then R672 is listed as 39 ohms, 1/2 Watt. |
| QUESTION NO. P80702-10: Samsung syncmaster 400Nb monitor, I need a sub for the optocoupler part number l 9805. |
| The 'L' is the logo for LiteOn, and 9805 is just the date code; the actual part no. should have been beneath these characters. But if this is a Samsung CKA chassis, and the optoisolator is at location OP601, it is listed as a LiteOn LTV817M-SM. |
| QUESTION NO. P80602-10: ViewSonic 17EA monitor changes color sporadically. CVA2419T is not available in this country any suggested replacement for this IC? |
| LM2419 is pin-compatible with CVA2419T, although it is slightly slower. |
| QUESTION NO. P80602-2: Samsung 17Glsi monitor with no high voltage. Replaced Motorola 16212 Q502 (Short) and open R505 (1.8 Ohm/2W). Now I can hear the High Voltage kick-in and being drop continuously. |
| First check if Q503, D509, C505 are also leaky/bad. If these are OK, check if there is a defect in the flyback transformer, or if the CRT itself is internally shorted. |
| QUESTION NO. P73102-9: ctc203 monitor is dead. Do I need an eprom and do I buy it from del bony? |
| Any number of things will make a CTC203 not power up. The EEPROM is a possibility, and yes you can buy it from Dalbany 1-800-325-2264 in Miami, Florida. There are lots of common component history failure repair tips info at home.mindspring.com/~wa6ati then click on "TSS log for RCA CTC203" www.paradigmstore.com/forum.html. |
| QUESTION NO. P80502-9: IBM 6547-0BN monitor. I am looking for info and possible replacement and/or datasheet for a HOT marked "SEC C5088". |
| "SEC C5088" stands for Samsung Electronics Corporation 2SC5088 which many electronic supply stores can carry. |
| This device is KSC5088, formerly made by Samsung Electric Co. (SEC). It is rated 1500 Vcbo, 800 Vceo, 8 Amps (15 Amp surge), 50 Watts, Tstg < 3 usec, Tfall < 0.2 usec, no internal damper diode. Possible substitutes include NTE2324, 2SC4923, 2SC49244, 2SC5299. |
| QUESTION NO. P72202-6: Toshiba D1566M-01 monitor blinks when lighting, the horizontal out is well, but I found a Tmost Fet 6.0 amp 200 volts in short. I need a substitute. |
| There are many (about 10 possible replacement MOSFETS) MOSFETS that would work, ECG, NTE has a free downloadable cross reference software at www.nteinc.com, www.moyerelectronics.com. |
| QUESTION NO. P71102-2: Tatung C7BTR monitor has s/c HOT type 2SC5386. I have checked for dry solder joints etc. |
| Check if C430 has bad ESR or value. |
| QUESTION NO. P80102-3: Sony CPD-200GS (SCC # L07A-A) monitor takes approximately 15 minutes to show a picture. HV is fine and the monitor stays on and eventually shows a good picture. |
| Check if the heater voltage is low at first. If so, check components in the heater supply, like C632, D615, switch transistors Q605, Q606, & the switch signal from pin# 24 of IC901. |
| QUESTION NO. P80102-4: HP D2846 monitor, picture is keystone-shaped, narrow at bottom, full horizontal deflection at top, and confined to the upper half of the screen. After 30 seconds or so, monitor loses sync and shuts off with yellow light. Yoke tests good. I suspect this is a Sony chassis. Major components test "good." |
| If your HP is Sony chassis code SCC-L04G-A, this is a Sony 21N3 family chassis, check for a defective IC007 = CXA2043Q. |
| QUESTION NO. P80102-8: Compaq P110 630 monitor, green color is not working (the red and blue still do). It is not the cable nor computer hardware/configuration. |
| If your P110 is a Sony chassis code SCC-L04 type, this is a Sony 21N3 family chassis. Besides faulty video cables/connections, a faulty IC403, the video output IC on the video ("A") board, can also cause this problem in this Sony, so try checking IC403. |
| QUESTION NO. P80102-9: Dell UltraScan 1000HS Model D1025TM monitor, I need the value of R577 (located near in front of the HOT Q507). |
| If this Dell is a Sony chassis code SCC-L07 type, like the Sony CPD-200GS, the schematic lists R577 as 12 ohm, 2 Watt, 5%, fusible. |
| QUESTION NO. P73002-7: HP D2817A monitor, FCC ACJ93312120, chassis HV5/HV5E. Problems when switched on, picture goes on and off (probably HV too). When warm, picture stays on, but it is still horizontally wavy on some resolutions. Checked FET Q549 (drain), HOT Q550 (base) and B+ voltages. B+ varies 40 volts when picture goes on and off. I looked for dry solder joints too. Could it be flyback or HV capacitors? |
| In other brands using the Panasonic HV5 chassis, similar symptoms to these have been caused by bad capacitors, C215, C212, on the CRT board. |
| QUESTION NO. P72502-1: Acerview99c FCC JVP7299C monitor. I need the value of RF3929 and cause for it to burn. |
| I believe this is the same as the 7279/7178 which is 22 ohms 3W. The coils in these burn also. Check L304, all the high voltage ceramics and the flyback. |
| I show RF3929 as 22 ohms, 3 Watts. Also check Q313 and the flyback. |
| QUESTION NO. P62702-5: Compaq S900 monitor after warm up, there is a pop and unit high voltage shuts down. Wait a few minutes and unit will power back up. |
| Check the two small bipolar caps near the main switch on board, they were two 1uF 250v in series can use X2 mains 0.47uF over both with some effort. |
| The pop is very often the FBT breaking down in the blead/focus resistor chain, therefore the eht sense usually taken from the bottom of this chain thinks that the EHT is too high and shuts down. |
| QUESTION NO. P72402-8: Acer 7176ie monitor has one white stripe horizontal. The supply on the IC201 is normal but I am not sure that it is the original IC201 because another engineer tried to repair it The ic is tda 4866, is this the right one or should it be tda8351. |
| IC201 is TDA8351, in the schematic; also check Q701 (2SB857) and R209 (1 ohm). |
| QUESTION NO. P72302-8: Daytek Dt-1731D monitor. I need the values of Q901 and R920. |
| Q901=STP6N60FI and R920=470ohms. |
| QUESTION NO. P71802-8: HP D5259A Monitor, I need values of burned R499 and R400. |
| HP uses chassis from several different manufacturers, in D5259A, but if this HP chassis is one of the Tatung chassis (C7B), my diagram shows R400 = 2.2K and R499 = 1K ohms. |
| In the chassis C7B the values of R499 is 1k , R400 is 2.2k |
| QUESTION NO. P71702-3: Samsung SyncMaster 3 Ne CQB4147 monitor, cannot adjust horizontal size. Related pot seems to be ok, no related circuit traces open; but H position , side effect, V size/position work all fine. |
| Check D407 and Q406 for excess reverse leakiness; also check for bad solder in this circuit. |
| QUESTION NO. P71602-4: Acer 7178ie monitor FCC JVP7178IE has no video for the first inch on the left side and small black lines appear streaking horizontally for the first two inches. The width, height and H/V size all work. Where the video starts on the screen it is very jagged. |
| Check/replace ceramic disk caps, starting with C383 = 100pF/2KV. Also check C366 (1800pF/500V), C368 (22nF/2KV), and C317, C384, C385, C386 (all 220pF/2KV). If not any of these, check if IC601 (UC3842) needs replacing. |
| QUESTION NO. P71602-8: Sony GDM5001PT monitor, the raster is shrunk from sides & it appears to have feedback problem and the raster is jumping some times. |
| Changing IC007 = CXA2043Q. Note, be very careful if desoldering and removing this IC, not to damage any PCB traces; also, sometimes these IC's will need a DAS adjustment of the trapezoid, etc, settings, after the IC replacement. |
| QUESTION NO. P61102-2: Sun/Sony GDM20E20 monitor. I need values for Q507 and Q508. |
| Based on a related Sony chassis, I believe Q507 is IRF9630 (or similar type) and Q508 is 2SC3997. |
| QUESTION NO. P62802-5: Mitsubishi Diamond Plus 70 Model TF-7700P monitor Chassis HVA9AP/Z/PF has power to the low voltage circuits and is able to detect when a signal is present. Power supply fuse is Ok. High voltage section does not power up crt. |
| Check Q550 (2SC5406A), Q881 (2SJ306), tuning caps C553 (1200pF/1.5KV), C554 (2200pF/1.5KV), C556 (470pF/2KV), and FBT T601 (ZTPL03001A). |
| QUESTION NO. P62802-3: Samtron sc428vs monitor, H.out transistor is burnt, I need the the number of it. |
| The HOT is 2SD1878. |
| QUESTION NO. P62702-1: IBM 6543-303 (G50) monitor, in mode 640 X 480 works fine, but in dos mode the vertical raster is reduced 50%. |
| Check the system control processor ST6370. |
| QUESTION NO. P62702-6: CTX vl500 monitor. I need the value of a R717 and C721. |
| There is more than one version of CTX VL500. If this chassis is a 1569E, then R717 is 3.9K ohm. If instead, it is a 1569S, R717 is 12K ohm. In both versions, C721 = 1 uF/50V, and in either case, your flyback transformer is also defective. |
| QUESTION NO. P62702-7: Packard Bell 1512SME monitor. The horizontal output transistor has gone. Which transistor do I need? |
| If the FCC# is H4ICM15006 for this Packard Bell, then the HOT is 2SC5129. |
| QUESTION NO. P62702-3: CTX 1875XE monitor turns on but there is no picture. Suspect tube is not getting eht. |
| You need to determine if the power supply is actually working. Remove the collector of the HOT and bridge a 60 watt 240V globe to where the collector lead of the transistors came from the the emmitter leg of the transistor. Take a DC voltage reading on the circuit board at the collector hole. You should expect somewhere between 112 -120Vdc (could be slightly higher depending on the set) over volts at this point could cause beam current limiting to bias tube off. If the voltage is present check the HOT remembering many such transistors have a diode in parallel with CE and can show a forward biased diode in both directions. Having established this check for a drive waveform on the base of the HOT with the collector back in circuit. If OK check for EHT by turning set on for a few seconds then off, using two screwdrivers, slide one under the altar cap and use the other screwdriver to discharge the tube to the back of the tube, if you have a nice splat assume EHT OK at this point. Then check to see if the heaters in the tube are lighting, if not chase the circuit back from the CRT board until you find 6.3V rms or within about 1-1.5 V using a standard multimeter. Note the 6.3V rms is usually obtained from the secondary windings from the H output transformer, using the flyback pulse. If none of these techniques prove fruitful, check for secondary voltages from the H output transformer and the switchmode power supply. It could also be prudent to check for the presence of a video signal at the R,G,B cathodes on the CRT board. Also check the tube grid voltages. |
| QUESTION NO. P62402-8: Samsung 550b monitor, in power part, the IC hybrid dp104c failure. I need its datasheet, parameter. Also its CPU DM024. |
| The DP104 is available from Samsung under the following part number BH13-00004A. Common failure part. No schematics or datasheet since it is a Samsung Hybrid. As for the CPU many revisions of this monitor exist and you will need to provide the Model number from the back. It should look like DP15xxxx or DT15xxxx. Only with this number can we find the right version. |
| QUESTION NO. P62502-6: Compaq S500 model PE1112. I need value of R415 burned. |
| Compaq is notorious for using different chassis under the same model number, but if your chassis is a Daewoo 518X type, R415 = 10 ohms, 1/2 Watt, and goes to pin 7 of the TDA4866 vertical IC, which is probably also defective. |
| QUESTION NO. P62502-10: LG795SC monitor FCC BEJCB790 has shorted Q514, 515, 516, 531 & D528. Flyback checks out at 34.6KV, not sure about IC501 but has 1K. Resistor at J80 link and link where R555 (1K?) should be according to my schematics. Is this assembly incorrect or is there a mod it just means that the spark gap has no resistance from the flyback point? This is the basic version or early version to the LG made Apple Studio Display M6496 17 inch. |
| That HV level is excessive; it should be about 26KV in this LG model. A bad flyback (6174Z-1024B or Y265382) can cause excess HV in this LG; the HV adjust is at VR501. |
| QUESTION NO. P62402-9: Acer 7277c monitor keeps switching on and off with no display. I replaced burned R356 only to have it burn again. |
| It sounds like a defective flyback transformer is burning the R356. |
| QUESTION NO. P62102-8: Apple M3705 monitor has a horizontal problem. Replaced burned RL163 but it burned again. |
| Try checking QL2, QL12 = IRF9630, QL23 = BUH1215, and capacitor CL9. Also check that the transistors are not shorting through their insulators to the heatsink. Check the solder on the Horizontal yoke connector, in case bad solder there had caused other failures. |
| QUESTION NO. P62102-2: KDS VS-5 monitor, the red is gone. Tried adjusting the red gain (digital), but nothing. The output (LM2406T) seems to be ok, redid some solders with no luck. |
| If this VS-5 is FCC# EVOKD-1510, first try checking the video cable for internal breaks. If this is not the fault, try tracing the red signal, comparing to the other colors, to find where red is lost. The RGB preamp IC should be IC201 = MC13282EP, pins 4, 2, 6 being the RGB inputs, and19, 22, 15 being the RGB outputs. These outputs go into the LM2406 at pins 11, 9, 8; and output from pins 1, 3, 5, to the CRT. |
| QUESTION NO. P62002-1: Sony monitor chassis SCC-L07B-A will not start, the led comes on green for a few seconds then blinks orange. During the period of time when the led is green the +B (which normally should be around 180V) is around 160V and the +15V is about 8.5V, and when the led is blinking orange the +B is around 150V and the +15V is about 6V. The monitor WILL start if I use an artificial load for +B (a 60W light bulb) but the voltages are all wrong +B is around 160V, -15V is -12.4V , +15V is 12.4V, +80V is around +60V. If I start the monitor in this way then remove the light bulb, the monitor remains on but with the same voltages described above. I replaced the optocoupler, all the primary caps, IC601, IC604, D614, D612, D622, D654, R628, R630 and removed D608 but the problem still remains. |
| Try checking the filter capacitors on the secondary side, like C622, C621, C619, etc., for high ESR, poor value, or leakage. If any are bad, also check if the rectifier going to that filter capacitor is leaky/shorted. If none are bad, try checking devices off the 180V supply, such as Q503, Q507, Q510, Q520, ultrafast D516, and the flyback. |
| QUESTION NO. P62002-9: Sony CPD-GF100 monitor is dim. There are no internal screen voltage or sub brightness/contrast adjustments. |
| Those adjustments are all done using Sony DAS software. You could check if the heater voltage is low, if Q001 is defective, or if the CRT has poor emission. Screen is controlled by opamp IC005, using Q001. If instead, the problem is low drive to the CRT cathodes, check if inputs to pins 25-28 of IC001 are too low. If these inputs are all good, IC001 may be bad. |
| QUESTION NO. P62002-7: Dell Ultrascan 17FS-EN monitor (Mitsubishi TFS6705) has no high voltage. On gate of Q603 there is an H-drive pulse of 500mVpp and 168V via T601 at its drain but it does not pulse. Are they good values? I changed Q603 but it continues and I have not found broken parts around it. All controls and power supply voltages are good. |
| Be sure the fan is running at the correct (3300) RPM. If the fan runs too slowly, and its pulse circuitry sends pulses too slowly, the monitor will shut down the HV. Sometimes the fan's bearings just need lubrication; the pulse circuit also can go bad. |
| QUESTION NO. P62002-4: Wearnes VGS-1490G monitor is blurry and dim even with setting the brightness & screen (at the flyback) to the maximum position. I checked HOT C5149 and Power FET SSH6N80 it's okay. |
| Unless the heater voltage is low, the CRT may be worn out (poor cathode emission). |
| QUESTION NO. P61202-3: Viewsonic E-40 monitor is dead, LED blinks. If I open ic ne555, set is on in normal but horizontal size is not right. Replaced ic ne555, no help. |
| There are several different versions of E40, but the output (pin 3) of the NE555 is probably driving the gate of a MOSFET, via a resistor. Look off the drain of that FET for a coil, and then an ultrafast rectifier feeding an electrolytic filter capacitor rated 200 volts or more. Check if the coil is shorted or has lost inductance, or if the rectifier is leaky in reverse or shorted. Also check the filter capacitor for good value and ESR. If these components are all OK, check if the NE555 is turning on the FET continuously, rather than providing pulses to the gate, due to bad component(s) biasing the NE555. |
| QUESTION NO. P61402-7: Panasonic PL-70 monitor has no horizontal deflection. Measuring Q550 gives nice waveform on oscilloscope. Bringing up brightness shows vertical line 4 mm wide. I am using P-70 schematic as it seems similar. R588 & R589 are ok. |
| Found the deflection problem. 1st problem was scope, measurement probe was partially broken, ( ground connector not connected sometimes) thus I had false measurements. The real problem was J114 was open, this is actually miniature fuse, rating unknown, maybe 1A. The reason for fuse blowing was Q881, 2SJ306 was shorted. |
| QUESTION NO. P61302-11: Proview 572 monitor is dead, read short across Horiz. output transister, Q601. |
| Replace shorted C635, 22UF@250 volt DC, connects to pin 3 of IFT. |
| QUESTION NO. P60602-1: EV700 monitor. Trying to determine a reason why transistors Q719 and Q721 (2SK2134) are burning up. Q719 burned up first and replaced, now Q720 is burning. |
| First, Gateway has used several different LG and Mag chassis, as model EV700, so further identification is needed, to pin down which "EV700" is your chassis. But I suspect yours is an LG chassis, and FCC# BEJCS789, from the FET references. If that is your chassis, these FET's switch the different S-caps. It seems possible, that the peak AC voltage to the drains of these FET's, via the S-caps, is exceeding the 200V limit for 2SK2134. Check for a bad winding from the flyback, T701, off pins 3, 4, 5, or a bad component off these pins, then follow it through SW701, to check L702, and R757, R758, and the S-caps, then continuing on to L703, R759, D717, and the horizontal yoke coil. Less probable, the 15V supply, for driving the FET gates, has gone very high in voltage. |
| QUESTION NO. P60602-5: Panasonic panasync S110 monitor chassis HV10S. The lower part of the picture has become a very dense line in the middle of the crt and there is nothing in the lower part of the crt. R482 (150ohm) has overheated beyond identification. |
| Your R482 and R483 should have matching values (other models use 1.2 ohm, 1 Watt), so compare R482 to the value of R483. Check if R482 burned due to an overload from a shorted component off the vertical IC, LA7875, including the filter cap off of pin 2, and check the vertical IC, itself, as well. |
| QUESTION NO. P60602-9: Calima 17 CB6748SNT2 monitor FCC GBVCA6738SS. Hot Transistor burned 2SC5302, any replacement suggested? |
| 2SC4891 is a possible substitute for a 2SC5302. |
| QUESTION NO. P60602-10: I need value for R241 and ZD202 in MAG LX1450LG monitor. All burnt beyond recognition. |
| R241 = 20 Ohms, ZD202 = 20V. I'd also check Q303, IC303, and the values of R325, R335 = 33.2K, and R334 = 1K. Also check/replace electrolytics, especially C315, C316, C335. |
| QUESTION NO. P60402-7: Samsung 700p plus monitor has vertical deflection rings. There are many randomly jumping vertical lines on screen. On middle there is only few scanlines within black 1 inch stripe and on most of lines are at bottom end of screen. Changed few caps at vertical deflection circuit. No help. |
| I believe you are describing vertical fold over. Check the Vertical output for the correct waveform and correct amplitude. If the waveform is present but reduced, the output stage is possibly intact. I had a similar problem with a TV, the end result was that the Vertical deflection yoke had gone from about 14 ohms dc resistance to 19.5 ohms. eg., Increase the line resistance and the deflection current will decrease. With the presence of the drive waveform confirmed, either ring test the V yoke for shorts or check the resistance for an increase. |
| QUESTION NO. P60302-8: Acer jvp7279g monitor. What type of FBT or are there any others I can use? |
| My notes show this Acer's FBT, as part code 19.70044.011. |
| QUESTION NO. P51402-7: NEC Multisync C500 monitor (JC-15W1VMA). No control over horizontal width or pincushion/barrel from onscreen menu even though the menu appears to function correctly. Screen picture OK but only 1/3 in width. |
| Check for shorted base emitter Npn transistor in horizontal drive stage. Also review answer for Question P5002-10 Packard Bell A720 monitor which will explain how these systems work. |
| QUESTION NO. P53102-5: Dell 828FI monitor 800F series works fine until turned off and back on, or reboot PC, than LED flash green twice as fast (blinks when connected to non working PC and constant ON when computer is on) but no video. Turn monitor off and disconnect from computer for about 5 minutes, connect again, turn on and everything works fine again until you reboot PC or turn power off and on. When power cycled on off on I can hear slight buzzing noise (very slight) like it is not enough power to kick in high voltage ether on power supply or on the flyback. I replaced hot Q406 transistor and the D403 with no effect, replaced C503, C606, C515 nothing changes. Replaced TDA 9109, it did not help. |
| The micom ic202 supplies OSD,to the video board.vert/horz sync to TDA 9109. According to Samsung, check H/V pulses Pins 4 & 10 of ic105 NO check ic105 OK same H/V Pins 20&21 ic202 NO ic202.The other ic is the E2EPROM ic205..There is a reliability mod for this chassis. With chassis removed, clean the lower edge of the bell CRT. Glue a piece of foil (3inches wide 10 long) along the bell over-lapping the rim band. This is to prevent static discharge from the CRT from damaging ic302 or the CPU. Many of the common faults on this product are attributable to ic302. |
| QUESTION NO. P52902-5: I need value for R935 in Daewoo Monitor 710B. |
| R935 is 82K ohms. |
| QUESTION NO. P52802-9: ADI ProVista CM700 monitor is dead. Customer reported smoke then died. HOT appears ok. Need values of R970, ZD 902 and ZD903. All burnt beyond recognition. |
| In the schematic for the ADI CM700, R970 is a 47 ohm, 1/2 Watt resistor, and ZD902 and ZD903 are both 36 Volt Zeners. |
| QUESTION NO. P52802-3: Tiny 17N (CA-65) monitor, the PS 'clicks' (about 4 or 5 times a second) for five or six seconds then trips (led blinks) and then repeats this continuously. PS voltages are present but some low, Q719 seems to get very Hot. |
| Check/replace L705, C735, D704, D705, D707, Q706, and the flyback transformer. You may also need to replace that Q719, if the overheating has damaged this FET. |
| QUESTION NO. P52802-6: AcerView 54e has no green color (red & blue are normal) upon powering up. The green color appears flickering after about ten minutes or so, then the colors gradually/suddenly becomes normal and stays normal until turning off. |
| Resolder the CRT PCB, especially check connector P101 and the CRT socket. If this is no help, see if there is an intermittent in the video data cable. |
| QUESTION NO. P52802-1: Sony GDM20e21 monitor has horizontal retrace lines on a white background with no video at all. I checked all solder connections. |
| I believe you are describing vertical retrace lines, these are not normally seen due to the electron beam being blanked out during retrace period. Video signals on monitors are directly applied to the cathode via the CRT board and a driver transistor, from the video board in the computer. A quick check with an oscilloscope at the base of the driver transistor will confirm the presence of the video signal. A condition that will produce the symptoms you have described, is when the screen volts have gone high. Most modern flyback transformers have a screen volts adj as well as a focus adj. Try turning down the screen volts to a suitable level to see if it has an effect on reducing the retrace lines and restores the video. If this has some effect check also that the B+ line has not gone high. Any increase in B+ will also proportionally increase the EHT. Small electrolytic capacitors in the power supply are the common fault for over voltage situation, so if the B+ is high check them all. |
| First check/replace IC420 = CXA1907S, the usual culprit. If not IC420, then check IC405. |
| QUESTION NO. P52002-10: Packard Bell A720 monitor horizontal deflection decreases with increase in resolution settings. Unable to adjust out with user settings. Display only covers approx 80% on lowest res and aprox 40% on 800x600. Vertical deflection also increases at same time and is set to minimum. Tried to test HOT but inconclusive. |
| A general rule of thumb I use for solving this common problem with monitors: From the front panel controls for H width adjustments pulsewidth modulation is used, by varying the pulse width the resutant output is a variable DC voltage. This DC voltage can be followed through to the emmitter of a transistor in the H/drive stages. A variable DC voltage at this point will vary the gain of the Horizontal waveform. So look for a shorted base emmitter in this area of the circuit. The Horizontal transistor is OK, if it wasn't then the set would not work. |
| QUESTION NO. P52302-3: I need a cross for a H6NA80FI manufactured by ST, it is a Power Mosfet that is used in the switching power supply of a Apple multiscan 15 AV Computer monitor. |
| STH6NA80FI is an ST Micro N-channel Mosfet, in an Isowatt218 case, rated for 800 Volts, 60 Watts, Rds < 2.2 ohms. Nationwide (www.neiparts.com) is listing the original STH6NA80FI, on-line. If a TO247 insulator is used, then STW7NB80, listed by Mouser (www.mouser.com), could substitute. Or, IRFPE40 or NTE/ECG 2377, with insulators, might be tried, though these have higher capacitance values. |
| QUESTION NO. P52202-1: NCD nc782aa monitor FCC A3KM053 when powered up, just the green light comes on. Checked the hot, it was good but monitor is not getting voltage to the hot. |
| From the FCC# for that chassis, try checking the value of R3570 (1 ohm), located by the yoke connector on the main pcb. If R3570 is good, check the FBT. |
| QUESTION NO. P52202-2: Gateway with Sony CPD15F1 Chassis was completely dead. Replaced shorted HOT Q507 and SW REG Q503. Unit now powers up, but both green and yellow lights flash after a few seconds with no raster. |
| Try checking Schottky D508, and check the boards carefully for bad solder joints, and for cracked PCB traces & rivet grounds near heatsinks, transformers, etc. |
| QUESTION NO. P52202-3: Gateway 2000 CrystalScan 1776 LE Monitor when powered up there is a clicking noise coming from the main control board and power supply board. I discovered L105 transformer was discolored and very hot to the touch, I need the value. |
| L105 (Mag# T*l-281-103-UO) has an inductance of 4.5 mH, and it should ring good. Since yours is discolored, it is probably bad. For replacement, try Mag Innovision, or suppliers like Nationwide (www.neiparts.com), or LJ Components (www.ljecc.com). |
| QUESTION NO. P52102-7: LG StudioWorks 775N monitor. Clicking relay with a blinking green LED. Replace IC901 but is still the same. |
| Check Q706, Q719, and D704 for leakiness or short. If not, try replacing the three voltage regulator IC's, IC923 = 5V, IC925 = 12V, and IC304 = 8V, which may fail under load. If no help, then replace the flyback, LG# 6174Z-1012B. |
| QUESTION NO. P51602-5: Sony GDM-400PS monitor, red gun quits after about 30 seconds; retrace lines show loss of red too. No other symptoms, cable tests good. Not sure if chroma, driver, CRT. |
| Try checking at IC407 = FA4111 (Sony part# 8-749-013-74). The red signal should input at pin# 1, at about 4 Vp-p, and output at pin# 3, at about 50 Vp-p, to the CRT. |
| QUESTION NO. P51602-6: Tiny 17N monitor FCC BEJCB775B. The supply trips with or without a dummy load when active, but remains rock steady at 160V in standby. 11V rail as marked on the board down to 8V, but I reckoned that would come up when the supply sync to line after start-up. The line stages look ok on first pass, no shorts on ht rail that are obvious either. I really need a chassis ID. |
| That FCC number, BEJCB775B, gives your chassis ID. This FCC is for LG (Goldstar), and is also used for the LG Studioworks 775N, LG chassis family CA-65. In that chassis, start by checking/replacing the Voltage regulator IC's IC925 (12V) and IC923 (5V), and then checking/replacing the flyback (6174Z-1012 or similar). |
| QUESTION NO. P51602-7: Radius Intelicolor 0461 monitor starts the HV for 3 seconds then shuts down while the power and stand by leds are flashing. The 144 Vdc in Power supply from 145 V falls to 56 Vdc. The adjust led stays in SIZE. |
| This Radius is a Sony GDM-20E01 chassis. In that chassis, when the power & power-saving LED's flash, and the SIZE LED is on solid, this is an error code for a problem with the ABL (beam current) circuit. |
| QUESTION NO. P51602-9: Hewlett Packard Ultra VGA 1280 monitor, there is no label on the rear, so can't identify further. Pcb is labeled #code no BH41-10308N. Other markings on the pcb are # CMG73*7 MAIN PWBMP-6.3. The problem is that there is fold over e-w on the horizontal scan, both left and right symmetrical about 1" either side. R427 is burnt beyond recognition. The picture is good except at the edges where folded over occurs, there, it is de-focused slightly. There are no obvious short/open caps or diodes around this area. |
| The chassis code CMG73*7 indicates that this HP is a Samsung chassis, similar to the Samsung Syncmaster 17GLi (CMG7377). In that chassis, the value of R427 is 1K ohms, 1 Watt. |
| QUESTION NO. P51502-6: Compaq Monitor P75 model 625, would not start up. Replaced open R622,1.2ohms and shorted D615 (with a high current diode). Monitor starts up and operates of input signal from base unit, D615 gets warm, limited brightness control. What is the value of D615? What could be causing D615 to warm up? |
| This Compaq sounds like a Sony chassis. Is there a Sony FCC# or a Sony "SCC" chassis code on it anywhere, like on the label or on the CRT housing? If yes, it sounds similar to a Sony CPD-200GS, SCC-L07 chassis. If it's like the CPD-200GS, R622 is 0.12 ohm, not 1.2 ohm. D615 is a 200 Volt, 4 Amp, 30 nsec ultrafast diode. If you did not use an ultrafast diode, this could explain your diode heating up. Possible substitutes for this diode include MUR420, UG4D, BYV28-200, NTE576 or NTE619. Also, D615 could overheat if the filter cap beyond D615 were bad; in the CPD-200GS, this cap would be C632. Other components on the supply going to the CRT filaments for CPD-200GS, are pass transistor Q605, and R637 (2.2 ohm, 1 Watt); the analogous components in this Compaq could also be checked. |
| QUESTION NO. P51402-10: Philips C2082DAS monitor. I need the value of C839. |
| If this Philips is FCC# GZM1323, I show C839 as 470 pF/2KV. |
| QUESTION NO. P51402-8: Nokia multigraph 445M092 monitor. T41 (2SJ307), D30 (UF5404) and R172 (0.47ohms) are burned. I measured D31, D32, D39, the 12V SMD-Zener-Diode (Y2) on the backside between source and gate from T41. They should be OK. I changed the burned T41, D30, R172 but they burned down again after 5-6 hours. |
| Check inductor M3 for burnt or shorted windings. |
| QUESTION NO. P50702-6: Dell D1025tm monitor (Sony CPD200gs) has a fuzzy picture. The keys on the front are locked up. When I press anything but the menu, I get a picture of a key in the lower left corner. The menu will only let me move between two of nine menu choices. How can I unlock it? Do I need the DAS software to do it? Dell could not find anything about it and the Sony manual does not say anything about locking the menu. |
| The Sony CPD-200GS does have a "Lock" Option in its OSD Menu; perhaps the same procedure is used in your Dell. Press the "Menu" key, use the arrow keys to toggle Up/Down and Left/Right, to select the "Option" Menu (at lower right), and then press "Menu" again. Several Options will appear, including a Key Icon. Toggle up/down to the Key Icon, then use the Left/Right keys to turn it off. Regarding the fuzziness, try going to the "Screen" Menu (upper right), and adjusting the H or V convergence, or the Moire. |
| QUESTION NO. P50902-4: Apple Studio Display 17 [M6496]. A standard fault in this monitor seems to be that something arches (assumingly within the flyback) that can go on for a while until it blows up other parts and the monitor stops working. I've got a bundle of these monitors that have stopped working. What other parts (apart from the flyback) should be replaced? When repaired by Apple their list of replaced parts show a diode, a rectifier diode RL2, an 18 Volts zener diode of type MTZJ18, a 2K resistor, the 2SJ306 MOSFET and the flyback (6174T-13003C or 6174Z-1024B or Y2653820). The 2K resistor is easy to find as there's only one on the print (R555), the flyback and the MOSFET are also obvious but where are the other parts (what are their part numbers)? |
| Besides the flyback, check FET's Q503 = 2SJ306 and Q507 = 2SK2847. D502 is an 18V zener such as you have described, used for gate protection on Q503, but also check D505, the diode off the gate of Q507. The D503, off the drain of Q503, is either RL2 or RL2A (Sanken ultrafast types); double check your exact type, as RL2A is rated at 600V, 1.1 Amps, but RL2 is only rated for 350V. Also check IC501, Q203, Q204, R547 (47 ohm), and the small diode connecting to R555, which is D532 (similar in specs to 1N4448). |
| QUESTION NO. P50702-7: Viewsonic 21PS monitor, FCC GSS933006 does not show any red color on the screen. |
| A common failure for loss of a color in this chassis is a defective IC1302. |
| QUESTION NO. P50302-6: CTX 1769se monitor. I need the value of Q313, A TO 220 package has marking as top DD 54 bottom RC 7L4. |
| The TO220 device, DD54RC, will be a Sanyo Damper diode, rated 1500 Volts, 5 Amps, Trr under 1.5 usec. But I would re-check whether this device was actually assigned as Q313 (typically a HOT transistor), or whether it has a "D" prefix location assignment. |
| QUESTION NO. P50802-4: Sony cpd-200es monitor has no green color, red and blue appear normal. |
| Replaced Q512, irfli530, problem still existed. Final solution was a bad video cable, pin 2 was intermittent unless cable was flexed 90deg to connector, cable was replaced and the problem was solved. |
| QUESTION NO. P50902-2: Acer 7277c monitor. I need to ID R330, R329, R365, & Q322. |
| R329 = 240K, R330 = 80.6K 1%, R356 = 10K, Q322 = A673. Check Flyback, normally when R356 burns the flyback is bad! |
| QUESTION NO. P40302-6: Acer 7277e monitor, no FCC came in with FR707 burnt, replaced with a 1ohm resistor. Picture shows 3/8 inch wide black line running from top to bottom, about 1/3 of the way across the screen from the left side. Q312, Q318 running so hot you can't touch the large heatsink they are attached to without burning yourself. It only takes a minute to get this hot. I replaced C335 (220pf, 2KV) with a 330pf, 2KV (all I had to try). Now after on for a minute, picture stabilizes to a normal picture, but Q312 and Q318 are still VERY hot. Before changing cap, picture never stabilized. Checked all diodes, and transistors in the area of the pincushion circuit. Also all the electrolytic caps near there. All power supply voltages appear normal, (used a schematic of 7276e which is somewhat the same). |
| Fr707 is on the 45v line from the power supply area and this feeds q312 via L301. This would be the first thing to check for burnt windings it should be 2mh. Q312 goes on to feed q318 via q317 and from there to D305 via L302 the next thing to check it should be 150uh. You might also check D318, and Q302. |
| QUESTION NO. P41002-10: Acer 1554 monitor, how do I set the color balancing? These monitors do not have any internal adjustments. |
| If you mean by color balance that either of the three main colors are too strong, you have to replace IC101 lm1203 as this ic does all of the color processing. Check pins 4-blu, 6-grn, 9-red, for signal level in and pins 16-red,20-grn,25-blu for signal level out. The voltage levels should be very close to each other in each group. |
| QUESTION NO. P41202-9: Acer 7277c monitor with a burned R356, I need the value. |
| On my cct for Acer 7277e r356 is 10k and connects to the base of q322 which is concerned with the ABL control. The other side of the resistor goes to pin 8 of fbt |
| QUESTION NO. P41602-4: Acer 7277e Monitor. I need the value of R339, which burned. |
| Rr339 is 3.9k 1%. |
| QUESTION NO. P 43002-8: Tiny A1770NSL monitor, the screen is too wide and bowed but cannot be altered . Electronically altered but controls have no effect . All other adjustments are o.k. |
| If this "Tiny" model is a LiteOn chassis (FCC# H4ICM17007), try checking Q423 and R411. |
| QUESTION NO. P43002-7: Mitac L1564PD monitor. Transitor Q502 was removed by previous repair workshop. I need the value of this. |
| In the Mitac manual's parts list, Q502 is given as 2SD921. |
| QUESTION NO. P43002-4: Dell D1025TM monitor, how do I adjust the screen controls , and the gain for the red, blue, green, (there are no pots). Is this chassis a Sony? What is the Sony Model? |
| This Dell is similar to the Sony CPD-200GS model. Service adjustments in that Sony model are done with the Sony DAS software and interface adaptor. Using the user OSD controls, brightness and color temperature levels may be selected. |
| QUESTION NO. P43002-3: Sony CPDE200 monitor has two horizontal thin, very faint lines running the full width of the monitor spaced about 100mm apart. |
| This sounds like the stabilizing wires for the aperture grille inside the CRT. These wires are a normal item, and are described on page 13 of the Sony CPD-E200 User Manual. |
| QUESTION NO. P41202-4: Magitronic C-SV1700PS FCC H4ICM17005. I need part # for HOT Q424 and D407 also, where can I order the EEPROM I703 and the parts above mentioned? |
| That FCC number is a LiteOn, and in that FCC, the HOT is 2SC5150 and D407 is a Sanyo DD54RC damper diode. Nationwide (www.neiparts.com) or B&D Enterprises (www.bdent.com) may have these. Also, if the HOT had shorted, see if there is an open 2 Amp microfuse on the board. Try asking Nationwide about sourcing the LiteOn Eeproms. |
| QUESTION NO. P41902-6: Techmedia TCM-1448G monitor FCC j4RTCM1448G. I needed part number for Q507. |
| Q507 is BU2508DX; a BU2508DF could also be used. |
| QUESTION NO. P41502-6: Compaq V500 model 1111 monitor has a pulsating picture with poor focus. Turn up G-2 then back down the picture stabilizes. If unit is turned off, then back on the picture pulsates again. |
| Replace all capacitors with 100v to 250v in H. section and resolder all h. out & v. out areas. |
| QUESTION NO. P41602-6: D2026T Ultrascan 20tx monitor has horizontal shake after about 1 minute of warm up. |
| Resolder all capacitors, TR, Diodes near flyback. Resolder crt board. |
| QUESTION NO. P40202-7: Trigem monitor, without the HOT soldered (I unsoldered from the board) the voltage (b+) on collector HOT is normal (110 to 130 Volt) but when I soldered that HOT on the board the B+ on collector HOT and on the power supply dropped into 30 Volt. What is the real type of this HOT? Is it C4762 or C4770? |
| Faulty FBT or Short pf in H. section. |
| QUESTION NO. P41802-2: Gateway CPD-GF100 monitor has a foldover at bottom of screen. By adjusting vertical position the foldover increases when lowering displayed image. It appears as though image was a sheet of paper curling upward from bott m reversing what is on front of the reversal. By adjusting vertical size it will fit but with a tenth of the screen black from bottom of image to bottom of screen. |
| Replace all vertical out put capacitors and resolder all joints in vertical section. |
| One cause for this symptom, is a bad C653, a 470 uF/25V capacitor. |
| QUESTION NO. P41802-10: Proview ps508 model 564px monitor FCC ije-564 is dead. Replaced blown C635 (22 mf cap 250v) and shorted D675 with no change. |
| Replace all caps with 250v near flyback and check dry sold joint. Resolder flyback and all pf. |
| QUESTION NO. P326-7: HP ultra VGA 1280 monitor has no picture. The flyback and horizontal output are ok. |
| H. oscillator IC faulty. Replace and also check 220pf with 2kv. |
