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Television Repair Answered Questions - Archived Files

Updated 1/3/03

All questions and answers posted here become the property of AnaTek Corporation
The content of these pages is copyrighted by AnaTek Corporation 1994-2002. This information is intended to be for the individual, private use of all visitors to this site. Reproduction in any form is prohibited. All other rights are reserved.

Page 2 Archived Television Repair

 

 

Home   New Test Equipment 

 

QUESTION NO. P52102-10:  Phi/Mag TS2546 TV NAP chassis 25F800.  Burnt resistor (R)3488. need value and watt. 
R3488=Philips old #4835 110 47026,new # 4835 110 47023=Generic # 4.7 ohm, 1/2 W.

 

QUESTION NO. P51702-9:  How do I get into the factory menu for a Zenith SJ2739TR TV?
Refer to question number P52002-9.

 

QUESTION NO. P60702-9:  Toshiba cx29679 TV Chassis TAC 8949.  I need the value of R-327 connected to IC-301 Vertical burned out. 
R327=5.6 ohms,1/2 watt fuseable.

 

QUESTION NO. P52202-9:  Emerson TC1994 TV, Chassis K9220 UF (Funai/Symphonic) UL43K3 had no power so I replaced C408=33 UF,250v and I am about to replace R453=?,7 watt (ceramic, stand up resistor) but need to know resistance value.  Note:  the following tv's have the same chassis Emerson TC1352, TC1371, TC1372, Citizen JCTV1578 chassis K9115 UF, Citizen JCTV3076  UF. 
R453=1 K ohm,7 watt cermet stand up resistor (white colored).

 

QUESTION NO. P60302-4:  Sony KV-27TS35 TV has bad audio with Cable but perfectly ok audio/video with VCD/DVD connected thru RJ connectors in the back of the TV.  This query is for clarification based on previous Q/A P1130-9 and P117.  Are the identified parts for different makes (RCA vs/ Sony) interchangeable while there is a significant price difference? 
Yes, all of the Sony US Sound Multiplexing MTS stereo modules are the same,  Some have 8 tiny smt electrolytic caps while others have 10 but all are the same,  Many manufacturers have purchased these modules from Sony, for a complete list of equivalent part #'s visit read this article contributed by me (Sidney Karam) to Nesda and written by Joe Sopko www.iwaynet.net/~nesda/May18.html.

 

QUESTION NO. P52902-3:  Sony KV32ts20 TV is dead, no sound or video.  Checked fuses - OK.  Acts like no power is getting to the set at all but 120V is reaching the "D" board. 
Replace shorted T605=Sony # 1-450-560-11 & R647 & D622.

 

QUESTION NO. P50902-9:  Sony KV-27XBR96S TV had intermittent picture then no raster but good hv and good sound.  All tuner and related circuits are ok g2 voltage is ok.  Checked the blanking circuit to no avail. 
Check to see if your CRT heaters are working (visual), if not check for the presence of 6.3AC rms on CRT board. If not present chase wiring back to main board, checking solder joints/resistors along path. The heater voltage is usually derived from a winding on the flyback transformer secondaries. If using a scope you will be looking for a flyback pulse. If using other than an RMS meter you will be looking for a voltage reading within 1-1.5 volts of the 6.3 volts.

 

QUESTION NO. P52002-9:  Symphonic SC319A TV/VCR.  How do I enter the service mode?
members.accessus.net/~090/awh/how2adj.html#5.11, qualitytuner.hypermart.net/codes.htm, es.geocities.com/Dudaelectronica/modosdeservicios.htm, www.repairfaq.org/REPAIR/F_tvfaqb.html#TVFAQB_006.

 

QUESTION NO. P50702-8:  Toshiba CX2978c TV was cycling on and off when power button was pushed.  Replaced C847 worked correctly for a short time now no +5V main relay not tripping.  Replaced C841 & C840 as documented in archives.  Also replaced str d1005 sub reg.  TV will only come on when pins 3 and 5 are touched with DMM.  Works for a short time then R840 overheats and screen goes green.  Also cannot make out value on schematic for R840 it's smoked now, it looks like 999ohms.
Replace C822=100 uf,16v located at pin 1 of Q802=STR-D1005.The value of R840=910 ohms,1/2 watts.

 

QUESTION NO. P51002-10:  Toshiba CX28510 TV, chassis TAC-9005 has no vertical deflection.  I replaced C301 & C303=1UF,50v (Brown Elna brand caps) along with IC301=AN5521=ECG1782 and R327=5.6 ohms,1/2 W which was open (defective) and C863=4.7UF,50v (red cap) in power supply.  On power up, IC301 became defective (pin 2=output became shorted to pin 1=ground) and of course R327=5.6 ohms,1/2 W became open.  I checked components in vert area for open or shorts to no avail. 
Answering my own question,C308=220 uf, 35v was the the culprit.

 

QUESTION NO. P51002-2:  RCA TV chassis CTC177AF2 powers up with a white horizontal line only, no sound. R4702U at qq, 13 is burnt beyond recognition. What is its value and wattage? 
R4702U=RCA # 218370=33 ohms,2 watt.

 

QUESTION NO. P41702-7:  Sanyo CTP 8651N TV chassis 80P.  Picture flickers intermittently mostly during moments of very white bright picture.  Replaced 12V zener D251 as recommended in service manual to no avail. 
Check D230 another 12V zener which can cause same symptoms, not found on all 80P chassis.

 

QUESTION NO. P43002-2:  Quasar VV123AW TV/VCR chassis KM-132.  Problem was washed out video all white.  I changed IC 451 (LA7835), now only have a horizontal line.  Changed the LA7835 a second time thinking it maybe bad. And yes the test switch is in the correct position.
Replace low ohms (1-10 ohms,1/2 to 1w)metal fusible resistor connected to vcc pins of LA7835 which are pins 1 & 7 and leads back to a rectifier diode which then leads back to the flyback transformer.

 

QUESTION NO. P43002-1:  Zenith Z35X21D TV came in with bad qx3481 trans. in power supply {shorted} and an open fuse fx3401.  I replaced the bad items also replaced icx3431.  Now the TV comes intermittently when it comes on it has perfect picture and will play until turned off.  I have scoped the drive signal to the horiz out trans when it tries to come on the signal is there momentarily.  The B+ voltage on the collector of the Horiz out trans is 134.1 when the set is not running when running 130.7.  
In this type power supply, always replace CX3413 (22mf/63v) and CX3416 (100mf/25v). Also check RX3404, RX3407 and RX3408.

 

QUESTION NO. P40802-9:  Magnavox XR2512 c101 TV has a black box appear over the picture after about 30 seconds. 
Try the customer menu under closed caption and/or text and turn of text. This sounds like a text box is on your screen.

 

QUESTION NO. P41502-7:  Zenith SR3587DT TV.  The picture quality is not good after changing picture tube and focus module. 
Re-adjust the color driver & pre-driver potentiometers on the crt board.  If still bad, your rebuilt crt could also be bad as most of the Zenith replacements I got had your symptom.

 

QUESTION NO. P41702-3:  Toshiba TV32C50 TV when first turned on, there is normal audio output at high volume level adjustment.  After set warms up for a few minutes, volume drops to zero with low hash type output. Picture is normal. Output audio IC checked OK.
Replace Sony MTS sound module # SBX1637-11.

 

QUESTION NO. P41602-2:  Sears 564-42191353 TV has a vertical failure, horizontal line in screen.  I am not familiar with this old circuitry, and I looked in the block where it says "V OUT" and I don't see any transistors, or ICs.  I see a module with three itty-bitty transistors and that is it. 
I fixed my own problem. Downloaded the schematic, and traced it to a defective service switch.

 

QUESTION NO. P41102-8:  CTC 187ch3 TV is dead.  All voltages on test points and microproccesser and eeprom check out right as per schematic.  HOT has correct voltage.  Q4852 regulator has voltage going in none coming out.  Q4852 is good. degaussing relay has no voltage.  Tuner has been resoldered and double checked. 
Location number escapes me, there is a 1 meg 1/2 watt resistor in the regulator circuit that fails commonly causing dead set.

 

QUESTION NO. P40402-3:  RCA T13060GY TV/VCR powers up for about 1 minute then shuts down the supply.  It acts as though it is going into a foldback mode. 
4.7 K ohms,0.7 W resistor in power supply, RCA # 232460.  680 ohms,2W resistor in power supply, RCA # 220655.

 

QUESTION NO. P41102-5:  GE 19TVR60 TV/VCR has a low B+ and pulsating low voltage supply's HOT appears good, no burned, hot or shorted transistors. 
4.7K ohms,0.7 W resistor in power supply, RCA # 232460.  680 ohms,2W resistor in power supply, RCA# 220655.

 

QUESTION NO. P322-4:   Panasonic CT1427R TV.  I need value of R805 and R810, are burned.
R805=10 K ohms,1/2W, R810=5.6 ohms,3 W.

 

QUESTION NO. P322-10:  Sony KV17747R TV, the menu does not respond to the remote control.  The video only shows three local badly colored pictures. 
Resolder degauss thermistor located in power supply near ac cord, open remote control apart and wash the rubber keypad with soap and a sponge, clean the remote pcb with Q-tips and Windex or any window cleaner, check solder connections of remote control at batt contacts and crystal and IR LED.

 

QUESTION NO. P328-7:  Sony KV32S10 TV has intermittent shutdown and pulses.
Measure B+ at flyback B+ pin if absent, replace flyback Sony # 1-453-146-21.  If flyback ok then replace PM501=protector module Sony # 1-810-061-11 located in D board.

 

QUESTION NO. P40302-1:  KV27v10 TV is dead.  Replaced the converters Q601 and Q602 (both shorted) as well as R607 (open).  The Horizontal Transistor was replaced (shorted).  Reflowed all transformer solder joints.  Set still dead.  The 14v standby is there now, but appears as though the set is still in protect mode.  T604 has ~23v on primary but not much on secondary (2.2v on some points of the secondary).  The relay will not close on the primary side of T604.  No voltage drop across the relay diode.
In D board, replace IC501=vertical o/p IC=Sony # 8-759-980-58=Generic # TDA8172.

 

QUESTION NO. P329-9:  Proscan CTC169EJ5 TV. CRT has bleeding colors like bad CRT, but CRT checks good on checker.
Try replacing filter capacitor for 200V supply to the CRT driver Xistors, C4703 47mf. 250V (located on main board).

 

QUESTION NO. P40502-5:  GE chassis ctc175a TV has a thin horizontal light across the CRT.
Check voltage at pin #1 of U4501 (Vertical Output IC).  Should be 24.8V. If 0V replace U4501 (PT #215531), and R4511, 1ohm/2W (PT# 215577).  If 24.8V is OK, Pin 17 of U1001 should be scoped for proper vertical output signal. Most often, U4501 shorts and opens R 4511.

 

QUESTION NO. P41202-6:  Sony KV-27TX40 TV.  I need the values for R650 and R605.
R605 and R650 each are 220 0hms/20W.

 

QUESTION NO. P327-10:  JVC C-14ET1EK TV was dead.  I changed the c912 and the power is now ok but no picture.  I changed Horizontal output transistor C5250 and flyback FCK14A028 but still no picture.  At the output, there is about 118v.
Horizontal pulses are provided by IC301 pin 41.  Power supply for this IC is +/-112V reduced by series resistor R323 (6k8 5W) to about 9V arriving at pin 42.

 

QUESTION NO. P40902-6:  Toshiba CF1311J TV Chassis 8930 has vertical deflection on top half of screen but not the bottom.  I changed all (3xx) caps in the vertical area, checked all resistors, caps, and also changed the IC with diode across IC.  VCC checks well on the IC. 
Change C301 & C305=1uf or 2.2uf, 50v both are red colored or brown colored Elna brand radial electrolytic capacitors, one is located near thr color processor and one near IC301=AN5515 or 21=vertical output IC.

 

QUESTION NO. P41002-8:  Toshiba 2050re TV, when switched on, black raster with a faint thin line in the middle of screen.  I changed the vertical IC with 2 brown elna brand caps (50v 1uf) with the same prefix as the IC.  Now the thin line in the middle of screen turns brighter orange. 
Replace the low ohms fusible resistor connected from the vcc pin of IC301 back to a rectifier diode which then leads back to the flyback.

 

QUESTION NO. P41002-3:  What is the service code to enter service mode on Panasonic TC21S15R TV?
www.calanan.com/panasonic.

 

QUESTION NO. P40502-3:  Toshiba CF2768B TV, when powered up originally, it had the typical vertical output problem.  I replaced C305 & C342 Elna caps with the respective 2.2uf & 1uf caps. Now the image comes up with black bars (approx 6 inches) across the top & bottom. By adjusting the R352 (Height Varistor) to the max, the image still has about 1 inch or so of black on top & bottom, & can see the closed caption info band across the top. I also resoldered the IC301 & checked several of the caps in the vertical section. 
Replace C301=1 or 2.2 uf,50v and make sure that C305 is also correct as I have sometimes put in a 1 uf,50v by mistake when the original defective one was actually a 2.2 uf,50v.

 

QUESTION NO. P40202-4:  I need to reduce the vertical picture on a Toshiba CF3060K TV.  There is no adjustment. 
Replace C301 & C305=1uf or 2.2 uf,50v red/brown colored electrolytic caps one is located near the color processor & one near  IC301=vertical output IC.

 

QUESTION NO. P40202-10:  Zenith SG3451T TV intermittently displays the number 800 followed by a bar graph at the top of the screen and other various fields with bar graphs as well.  The picture quality is fine otherwise. 
Resolder connections to the ZCU ic found beneath the pip daughter board located on the 9-700-xx module.  Common problem with zenith digital sets.  A lot of disassembly is required, be careful pulling connectors.

 

QUESTION NO. P31-2:  Hitachi 2750 TV.  Require pin out of IC HA11511NT.  IC not providing horz out, is IC defective or is VCC not present? 
I have had to replace this ic numerous times. It just seems to fail whenever.  99% of the time the set stays working too.

 

QUESTION NO. P312-3:  Sears 564-42904850 TV does not start up, power supply seems ok, b+ at regulator. 
Check Hold-down circuit as follows With TV off, short pin #4 of IC401 to ground.  If set powers up OK, the hold-down circuit is defective and shutting down the sweep circuit.  Turn off TV and remove short (not removing short can cause radiation hazard from excessive high voltage).  Turn set back on and check voltage at pin #4 of IC401.  It should read 0.2v.  If voltage is high, check the B+ at the cathode of D032.  It should be 129/132 volts. If too high, replace Regulator B001.  If hold-down circuit and B+ are OK, check 20v source at D031 and R031.  Also check Q403 H. driver, base 0.4v and collector 41.2v.  Check supply voltages from flyback, 15v at D496, and 26v at D495.

 

QUESTION NO. P311-6:  Phillips Magnavox TS2754C101 TV will not power up.  Push power button , relay clicks and power LED lights for 1 second then relay clicks again. 
Check to see if the Horizontal Output Transistor has shorted between Emitter and Collector.  Also verify that there is dioding between these two terminals. High resistance one way, lower the other. The difference is usually at least a factor of 8.  If the HOT is okay, start checking the main power supply board for a shorted eletrolytic.

 

QUESTION NO. P313-3:  Sony KV27TS29 TV lost power while operating.  Input fuse OK.  This happened 3 months ago and fixed by replacing Q601, Q602, & Horiz output with Sony parts.  I have not checked these replacements yet, but think I missed something else with the original fix. 
Good chance R607 is also open but to prevent repeat failure, resolder connections on the horz drive transformer.

 

QUESTION NO. P313-9:  Sony KV27V10 TV.  Replace Q601, 602, R607 & HOT.  Unit will play for a short period of time, pop same parts bad again.  Part of the time unit will pop immediately after parts are replaced.  Have two doing this. 
Besides replacing those components make sure you resolder the horizontal drive transformer connections.

 

QUESTION NO. P37-5:  Wespointtv-9951a TV, what would be the X.ref for transistor SSP7N60A? 
Possible substitutes for SSP7N60A include IRFB9N60A or IRFBC40A, both listed by Digikey (www.digikey.com), or possibly NTE2379.  Also, Fairchild has replaced the original SSP7N60A, with its device, SSP7N60B.

 

QUESTION NO. P220-3:  Symphonic SC3619 TV/VCR.  I have been unable to locate the cassette LED locally.  I need the specifications for this LED (voltage, etc.) or a Radio Shack p/n that will work in place of a manufacture's part. 
Most LEDs operate within a given voltage range, and a radio shack unit that is of comparable size should be just fine.  These types of sets do not normally usually expensive or exotic discretes so there should be no problem.

 

QUESTION NO. P221-2:  RCA F26634SF / CTC187AB TV has no sound and no video with only the "no vert sweep " line.  I have done the tuner wrap on it and replaced the eprom.  All voltages seem normal. 
Look for a cold solder joint in the vertical drive, as well as in the area around the low voltage power supplies, also check the inductors in the vertical drive for a cold solder joint where windings attach to pins, as well as any transistors in the vertical drive section.  See if there is a short in that area too, there may be a fuse, or fusible resistor to the vertical drive and audio stages that is shared by the two.  Also check the power handling inductors for a possible cold solder joint where the windings connect to the pins that pass through the PC board.  If the set uses a switching type of power supply, (it should) check the caps in the power supply providing the low voltage to the audio and video processing IC's, and check the regulators/zeners (actually check the voltage immediately after them).

 

QUESTION NO. P225-10:  Zenith Sentry 2 TV has horizontal lines through picture after warm-up.  Problem is temporarily fixed with changing of brightness and contrast.  
The horizontal lines are probably the retrace lines resulting from an inadequate blanking signal.  If you are not able to adjust blanking, try reducing the AGC setting slightly.

 

QUESTION NO. P27-10:  Sanyo avm2151u TV has a flat horizontal line in middle of screen, rest is blacked out.  Every capacitor, transistor and diode seem ok in the area.  Could it be the HOT?  There is also a sip ic LA7837 which I don't know what it is in the area. 
LA7837 is vertical out IC.  Measure each pin, look for B+ (26-33V) on some of the pins.  If not there, look for approximately 1 ohm open resistor, B+ on one side only. If B+ is present on the IC, consider replacing the IC. After that, replace any red/brown electrolytic caps (1MFD, 2.2MFD, 35-50V) in vertical circuit.

 

QUESTION NO. P921-3:  Just beginning to work on TV's.  Recently a new TV/VCR (one-piece set) was stored in a basement which flooded, submerging the TV/VCR for days. Of course, nothing works.  Before I decide what to do, is there any chance that it is easily fixed (with the replacement of maybe a few small parts.)?
NOPE!  Any conductive material that has coated the pcbs must be removed, requiring removal of all components on the pcb and then chemically cleaning it. Then, checking each item and replacing them in the correct location.   Not to mention the havoc this kind of thing will have in the mechanics of the video section.
I have a feeling that you are really going to get your feet wet on this one.  OK, pull out the circuit boards and wash them with a stiff brush in clean water. Air dry completely! Then check them over very carefully with a magnifying glass, especially the solder joints and copper runs. Does anything look corroded? Are the solder joints a very dull or black color? I had a set where the jumper leads on the top of the board were green and the solder joints were black, but with many diligent hours of cleaning solder pads with a fiberglass brush and resoldering, it was able to be saved.

 

QUESTION NO. P87-9:  Have a Funai 13" TV/VCR Combo 13FIII.  Receiving power from cord.  No picture or sound from TV portion.  Tape In keeps flashing in the display but there is not a tape inside the VCR. Also, when I push the power button, it automatically shuts down. The TV/VCR also seems to have a delay in power to all once the set is plugged in.
Look for cracked traces at the pins of the regulator transistors on the power supply PCB.

 

QUESTION NO. P221-5:  AWA Thorn C6334 TV, the bottom half of the screen is black to a thin horizontal line in the middle.  Above this horizontal line the image is just oblique lines.  The sound is ok.  This very similar to previous questions (Q P126-6 and P1029-3) but they refer to different brands.  I replaced all electrolytic caps on the main chassis. 
Sounds like scan lines.  I think the LOPT, Line Output Transformer, needs replacing.  It has two knobs, one for brightness and the other for focus, usually says it on it.  Also there is high tension lead that goes into the back of the TV screen itself, it's made of rubber, and looks like a suction thingy.  *****Before removing this, get a screw driver and a attach a lead, or wire to the metal part.  Then attach the other end of that wire to EARTH, somewhere.  Make sure you are only touching the handle of the screw driver, wear rubber gloves if necessary, and stick the screw driver in and under the suction thingy, you should hear a crack, or pop.  When the crack or pop is heard, it is safe to disconnect the LOPT.  If you don't hear a crack or pop, then maybe the LOPT has discharged itself, if you haven't had the TV on for ages.  After that de-solder the LOPT and replace it. 
Check the vertical circuit first.  Look for 1mfd and 2.2mfd 35v-50v caps and change them.

 

QUESTION NO. P124-8:  RCA CTC169CA5 TV when turned on, I hear a click and then it turns off.  I checked for cold solder joints and checked the standby 15V (TP 4103) and I get 8 - 17V.  Also, I hear a buzz noise that follows the spikes in the stdby voltage.  The Reg B+ is also spiking between 180 - 187V. 
cr 4118 should have about 13.5vdc at standby.  If you press power, and the voltage drops the diode is at fault.  I usually replace cr4118 on all ctc169's.  Your standby regulated voltage should be corrected to about 140vdc before you fire the set up.  All elecrolytics around u4101 should be replaced.  Replacing c4401 and c4402 would be a good idea, too.  Run regulated voltage is 143vdc.

 

QUESTION NO. P221-7:  Proscan CTC169BK TV is dead.  B+ raw is 158VDC and B+ regulated is 162VDC in standby.  Replaced C4151, CR4122, C4108, CR4101, C4104, C4102, CR4123, C4401, C4403, C4402.  No change in voltages.  Have not tried U4101, but it seems to be working.  Voltage at pin 16 is 11.2VDC, but voltage at pin 15 is a little low 8.5VDC.  Chopper Q4101 appears to be fine and outputting. HOT Q4401 collector has same voltage 162VDC and appears to be fine.  Secondary voltages on T4102 appear to be fine, but yet the B+ regulated is still too high.  Press power on button and just get clicking sound.  Also noticed that RT4201 had one lead broken for Degauss circuit. 
Check cr4118, it should be at about 13.5vdc at standby.  When you press the power button, does the voltage drop?  Also clean up u4101 circuit.  All electrolytics around it should be replaced.  The set may be going into shutdown.  Standby regulated voltage should be about 140vdc.  Run regulated voltage is 143vdc.  I would not try to fire her up until you get the standby voltage corrected.

 

QUESTION NO.    Magnavox TV Chassis #25P606-00AA with wiggling on the sides of the screen.  Looks like a vertical problem. Fixed four bad ones solder joints near the VOT <Vertical Output Transistor>.
Check all the caps in the horizontal circuit with an ESR meter.  Especially check for a bad C432 by the FBT.  Wiggling on the sides usually indicates problems in the horizontal deflection circuit instead of the vertical circuit.  Also make sure to check the solder joints on this board very carefully, they are notoriously bad for cold joints. 
Check or look for a 100MFD electrolytic cap in the horizontal circuit.

 

QUESTION NO. P130-5:  GE RCA TV Chassis Ctc 175L when unit is cold the picture and sound operate fine for approximately 5 minutes or less.  Then it loses all channels as if the cable wire is disconnected.  I resoldered all tuner grounds and all the processor ground around U1001v (La 7610) no change.  Also resoldered the white wire leaving the tuner section and going toward the front of the chassis, no change.  Also need to know how to get in the service alignment section to write down all the values of the eprom.  I know about pressing and holding menu, press and hold power release the hit volume + and advancing to V 76 but I need some help to get into the other areas of the eprom to write the info down.
Refer to instructions and table written on parts location diagram mounted inside back of set.  You may also want to embody technical bulletin # 97-003 for television.

 

QUESTION NO. P212-5:  Philips TS2744 C106 TV chassis 27B700-7562 was hit by power surge.  I need the value of C506 which was fried. 
Service manual lists C506 as 680pf 2kv ceramic disc for 25" and 27" models, and C506 is 1000pf 2kv for models with A68AHD32X crt.

 

QUESTION NO. P27-4:  Philips 28PT4521 (Chassis MD1.1) TV has no video, sound and OSD is OK.  Video processor TDA8366,  C2122 and C2143 replaced. 
Resistor 3450 (68 Kohm) on main board is o/c.

 

QUESTION NO. P26-2:  Mitsubishi cs-26201 TV has a large black square that covers almost all the screen.  If volume up or down is pressed, the square disappears for 3 seconds, then it comes. 
Using remote control, find teletext or text on a menu screen.  Turn off.

 

QUESTION NO. P12-3:  Toshiba 19A20 TV has raster but no sound or video.  Sub tuner & IC TA1223AN, same problem. Could it be the micro?  I have OSD.  I also sub EEprom. 
Missing 5v source to tuner.  Q830 2SC1815 REG. leaky & D830 5.6v Zener diode shorted.  Replacing both fixed the problem.

 

QUESTION NO. P125-5:  Qausar VV2706 TV/VCR.  Only see green LED blinking, nothing else. 
Press and hold down the power button for 10 seconds.  It sounds like it is in parental lock.

 

QUESTION NO. P123-2:  Toshiba CX28409 TV Chassis TAC8915.  Replaced IC301, vert O/P (AN5521), diode, resistor off flyback (26V supply), all electrolytic caps in vert circuit.  No bottom deflection, top of pix overlapped severely.  The vertical windings of the yoke measure 4 ohms. The yoke is bonded to the CRT (made by RCA). 
Replaced C301 - Cap checked good - substitute a new one as a test - C301 is 2.2 uf/50V.

 

QUESTION NO. P114-2:  Zenith SR2773DT TV shows a good color bar pattern with my color generator.  But tuning in a golf game the green golf course is light brown.  I also cannot get a good greyscale.  Collector voltages on Xisters are correct--248V.  On the CRT board, the 250VDC supply is filtered through a 1mfd/315V cap and a 330 microhenry coil (which were replaced to no avail) then to all driver collectors.  It is on this end of the coil that the RF ripple appears on the scope.  It is there when the CRT board is on or off the tube, and even with the CRT socket off the board it is there.  The R and B output pins on the video output IC show a normal waveform on the scope.  The G output pin shows evidence of high freq. oscillations and a lower Peak-to-Peak waveform.  The video chip was replaced with no improvement. I cannot understand why the green off the colorbar generator looks good on the screen but the green in a regular picture does not. 
I'm not familiar with the set you speak of but the problem sounds familiar and it was with several small 19 inch with remote Zenith's.  What solved the problem was removing the tuner, pulling the cover to the solder joint side and with an eye lope magnifying glass 4X to 8X in power and in very good lighting mark every bad solder joint for resoldering. When I had finished I had resoldered 27 bad joints in one tuner alone.

 

QUESTION NO. P117-1:  Panasonic CT32S20U TV, Ch. ANEDP275, Picture cutoff 1/4" on right side of CRT.  Original problem shorted rectifiers and regulator, cold solder joints.  Sweep linear, purity and convergence OK.  Horizontal centering? 
I have most often found this to be the small 160v caps in the horz sweep are starting to dry up.

 

QUESTION NO. P114-8:  Mitsubishi CS-3104RA TV, there is a horizontal area about 2 inches wide in the center of the screen that is not scanning properly.  The scan lines are spread apart.  The rest of the screen top and bottom is working perfectly at this time.  After about 1-2 minute warm up, the center of the screen clears up and the bottom of the screen now has about a half inch wide area of improper scanning.  Tried freezing the individual components and tapping for the usual cold solder joints. 
It was a 100 Microfarad polarized 35 volt cap at C4E5 which is in close proximity to the LA7838 Vertical deflection output IC.  I replaced it with a 50 volt one and it works perfectly.

 

QUESTION NO. P111-4:  Magnavox 27y105-00aa TV has blown R432, I need the value.
The value of R3432 is 1K. After replacing resistor, replace the stk30130. 
I have found on a very similar 27in. Mag, after replacing vert out IC and 1ohm r, that there was 60 cycles floating in the picture and that b+ reg was too high (156v) and TV did not shut down.  Changed 100mfd/200v cap in hor out area fixed both.

 

QUESTION NO. P1217-8:  Sony kv27ts27 TV has distorted sound.  I replaced the audio output ic tda2009a but the sound is still bad.  I soldered every suspected solder in the audio board. 
Replace the SBX module (caps leak onto board) for example only----SBX1638-11, they make several different units so take the number off your module.  Tritronics, Electronix, Andrews Electronics all carry it.

 

QUESTION NO. P1218-5:   Fisher PC-320C TV chassis A7F-320C0.  I need help localizing IC manufactured by Toshiba P/N 43206205A Other markings in the IC TMP47C4DPSC and QC0568.  From Toshiba dealer is "IC not longer under production". 
I found part numbers for two IC's for the Fisher TV PC320 (should be the same as the PC320C).  IC 201 46-13727-3, and IC 101 46-13379-3, Sears part numbers Division 57, Source 528.

 

QUESTION NO. P1213-10:  RCA ctc 177be TV is dead.  I changed the regulator and hor output.  I need the procedure to program the TV and new eeprom.
Go to http//repairfaq.physik.tu-berlin.de/sam/rcatune.htm under eeprom section.  Very good information on your problem.

 

QUESTION NO. P1129-9:  Panasonic Ct27sf12t TV Chassis AEDP248 can be turned on and off, the blanking bar (black bar about 2" thick across the screen) will be somewhere in the picture, not rolling or moving at all.  If turned off and on 10 to 15 times, it will be out of the picture, locked in where it should be. 
home.mindspring.com/~wa6ati/pan-new.htm

 

QUESTION NO. P126-8:  Magnavox 25TR12 C221 TV has lost horizontal hold. 
C432=100UF,200v replace with 250v.  Also solder horizontal and power supply components that have aged solder.

 

QUESTION NO. P1114-10:  JVC av29sx2ek TV, how do I get into service mode? 
members.accessus.net/~090/awh/how2adj.html#5.11

 

QUESTION NO. P1116-6:  Emerson tc 1994 TV.  Need value and wv of c 453. 
C453=1UF, 160v replace with 200v or 250v also replace C408=33UF, 250v (located in power supply used to filter the 5v standby) and also C443=10UF,250v (located between flyback & heatsink).

 

QUESTION NO. P111-10:  Daewoo DTQ-25S2FVC TV with Q 804 (E13009-2) in power supply shorted. What is this transistor and is there a sub for it? 
 E 13009 is a NPN bipolar transistor often used in SMPS for PCs. You can replace with 2SC4161, for example.

 

QUESTION NO. P1029-5:  Magnasonic ELT-5205 TV Chassis C-231B the yoke is burn , what is the part number?
Most of the 20" Daewoo chassis use the generic Daewoo # ODY-M2002 (white plug) which has several equivalents.  Daewoo OEM # 58D100026 or DSE-1922FL. There should be a white sticker on the yoke assembly itself which would confirm the above info and can be purchased from many electronic supply stores.

 

QUESTION NO. P1029-10:  Sanyo AVM-2752 TV works until turned off for a few minutes. Sometimes the set will come back on, other times it will not come on at all until the cord is unplugged for a few seconds and then plugged back in. If it does come back one before unplugging, sometimes it has lost channels and some new features in the menus appear even though they are not supported by this set (ie. surround sound).  Unplugging the set always seems to reset it.
Check Q052=ECG382 and D509=18V zener.

 

QUESTION NO. P1019-4:  Quasar vv1307 TV/VCR (Panasonic pvm 1327 chassis) relay clicks, hv shuts back down.  I jumped the relay, everything works except audio and the tuner.  All voltages read ok. 
LA7837 Vert IC and R414 2.2ohm .5w.

 

QUESTION NO. P1024-7:  Philips Magnavox MX3291B101 TV chassis 32D700 is dead with the exception of motorboating sound from speakers and relay clicking on and off.  All Power supplies are normal, no high voltage or Horiz. drive. 
There are many possibilities so I find it easier to post the site home.mindspring.com/~wa6ati/D7-DOC.pdf.

 

QUESTION NO. P116-2:  RCA F32645 TV chassis CTC203CX.  The audio amp is good as I can adjust the volume of the static, but there is no program sound.  All externals seem to be correctly set. 
This website has info on audio problems:  home.mindspring.com/~wa6ati/CTC203.htm.

 

QUESTION NO. P118-8:  Sanyo DS25330 TV.  I need values/crosses for R009, R008, R004, IC001, C007, R007, R021, R022, C021, C001, and R310. 
I can only help you with the following:
R008=220 ohm,10W (wire wound), Sanyo # 402 060 4606
R009=220 ohm,10W (wire wound), Sanyo # 402 060 4606
R004=5.6 ohm,2W
IC001=STR30130
R473=6.8 ohm,8W (wire wound), Sanyo # 402 067 8201

 

QUESTION NO. P1120-10:  Zenith SS6589W TV chassis #9-825-1 is missing 2 inches off bottom of screen.  Everything checks out fine. 
Check CX2111 for open and RX2126 if available in your model.

 

QUESTION NO. P1031-9:  Panasonic ctn1956r TV chassis andp 201.  I need the part number for the microprocessor IC which is missing. 
Microprocessor Panasonic# MN15151Q14R=$16.  Note this micro is also used in several other Panasonic Models one which is a 20" Panasonic stereo tv model CTM-209S, Chassis ALEDP203, Jan 95, pcb location IC001.

 

QUESTION NO. P1119-3:  Toshiba CF-2647 TV, works fine, but it clicked (arced) extensively on startup several times and now the startup clicking stopped, but the flyback connection to the CRT tube back exhibits arcing. The flyback solder joints look good, and the fact that the TV still works leaves me stumped. 
In a similar model 27" Toshiba stereo tv model CX29679, chassis TAC-8949,year Sept 89 the unit initially exhibited the same symptoms but eventually it would not come on and only single relay click was heard.  Power supply C863=4.7UF,50V (red/brown colored Elna brand) was the culprit and I decided to replace C301 & C305=2.2UF,50V (red/brown colored Elna brand) vertical filter caps which usually go bad with time.  One is located near tv color proccessor and the other near IC301=vert o/p ic.  In another similar model 27" Toshiba stereo tv model CX2828C, Chassis8815, year Nov 88 the culprit turned out to be C822=100UF,16v located in power supply at pin 1 of Q802=STR-D1005(sub power reg).  I also replaced C301 & C305 in this unit.

 

QUESTION NO. P1029-3:  Toshiba CA 14159 TV (equivalent to CA14119), the bottom half of picture is black (looks to be related to a vertical problem) and top screen image is squeezed; sound is OK. 
Replace two red/brown colored Elna brand of caps in some models pcb locations C301 & C305=usually 1UF or 2.2UF at 50v.  One is located near the tv color processor the other near IC301=vert o/p ic.

 

QUESTION NO. P1024-10:  Magnavox 27tsc6 2102 TV chassis 27b511-00aa, it seem like horizontal frequency is out of whack.  Replaced IC-jungle,LA7674 and voltage regulator IC, STK 730-020 with no help. 
Replace C432=100UF,200v upgrade it to 250v.  Also resolder power supply & horizontal section components that show sign of aged solder.

 

QUESTION NO. P1116-10:  RCA ctc177BE TV is dead, fuse ok. horiz. out (d1885) seems ok. 
Solder tuner & micro grounds then replace U3201=EEPROM RCA# 218398.

 

QUESTION NO. P1029-4:  Magnavox TV, Chassis # 19Y400 has no audio or video and the voltages looked OK.  I replaced the tuner and still have the same problem. 
Replace Z463=483513037121,check R360 & R361=483511657275.

 

QUESTION NO. P1023-4:  What is the service code to enter '' service mode '' on Phillips and Panasonic televisions? 
http//www.calanan.com/panasonic/.
Electronic Servicing & Technology Magazine issue June 1998 page 24-39.To order back issues for about $4 each, call 1-800-853-9797.  Philips tv - to enter service menu use the remote control and enter the following seven-button sequence 0,6,2,5,9,6,menu.  Depressing the power button will exist the service mode and save the current changes.  It will also turn the unit off.  Panasonic tv- while the tv is on and operating, momentarily short TP-8 to ground(FA-1 to FA-2 on the A-Board).A yellow on screen "CHK" will appear in the upper right of the screen.  (This is the "aging mode.").Press the ACTION button and VOLUME UP button on the front panel at the same time.  The yellow "CHK" will turn red.  You are now in the service mode. Use the POWER button on the remote control to select one of five service ajustmentsB, sub-adjustments; C, CRT adjustments, D, pincushion adjustments; S factory adjustments only; NORMAL TV, normal operation of channel and volume buttons.  The adjustments will appear in the lower right corner of the screen.  Channel buttons on the remote control let you select the feature, and volume buttons let you change the registe value.  To exit service mode, press ACTION and POWER buttons at the same time for about two seconds.  The tv will momentarily turn off and come back on tuned to channel 3.

 

QUESTION NO. P117-6:  Sony kv25xbr TV has poor sound, control audio, image are good, no noises audio. 
If unit has US Sony sound mplx decoder HIC (MTS) module, replace any with any of the following part #'s GenericSBX1637-11, SBX1637A-01/02, SBX1638A-01A, Sony#8-746-371-10/11/20, Hitachi#1381181, RCA#SKUP9102,201632, Zenith#905-2321, Goldstar#OIS0163702A, Sears Canada# 575251381181.  Another solution is to discard tiny Sony sound module from board and replace with 2 caps (4.7UF,50v), pin 12 put + of each, and pin 10,pin 11 for -.

 

QUESTION NO. P116-1:   RCA F26051EMFE1 TV, there are white horizontal lines showing on screen. 
Re-adjust the brightness (G2)control adjustment on the flyback transformer by turning it counter clockwise.

 

QUESTION NO. P1019-5:  Sanyo DS27780 TV Chassis 27780-01 has no sound out of speakers or audio output jacks.  Audio Amp IC001 is fine.  Used audio signal tracer and found sound going into daughter sound card, display shows volume level and speakers are not muted. 
Found bad IC3601 CXA1279AS.

 

QUESTION NO. P1119-2:  Zenith SL7784BT TV has a very dim picture.  The CRT filament voltage is only reading 1.8 volts.  How do I adjust the drives and screens?  There are no controls on the G-2 board or any where else. 
Picture is defective a common problem with about 80% of all Zenith crts.  Call LG Electronics (Goldstar,Zenith) at 1-800-243-0000 and speak to a Zenith tv tech.  Some Zenith tv's have 3 and some have 4 year warranty on the picture tube.

 

QUESTION NO. P1120-3:  Sony TV KV 27TS30 has reduced HV but is not adjustable in this model. 
www.videotech.org/sony.htm

 

QUESTION NO. P1121-6:  Sony KV-27S25 TV, can hear high power kick on and immediately off.  There is a constant one second blinking standby light.  The troubleshooting guide points me in the direction of the Y/C Jungle IC301.  There is a PIP model so I was wondering if this is the reason the motherboard says a Y/C/J ckt.  If so, is IC351 the Jungle ckt because I cannot find an IC301?  Reflowed the tuner to no avail. 
www.videotech.org/sony.htm

 

QUESTION NO. P1120-2:  Hitachi 31CX4BC TV chassis A3LXU has the vertical jitters when cold and sometimes will flat line. 
Check soldering at vertical output IC & heatsink.  If ok, replace all vertical electrolytic capacitors in that have the same prefix designation as the IC.  Along with the IC also check vcc supply diode connected to IC and the fusible resistor leading back to flyback x-fmr.

 

QUESTION NO. P1121-3:  RCA Proscan PS27121 TV Chassis CTC169CD is missing 2 l ines from top and bottom of screen.  Replaced Q505,Q506.  Picture did not change.  
Resolder tuner & micro grounds, then copy EEPROM parameters down then replace EEPROM=RCA# 209955.

 

QUESTION NO. P1121-2:  GE 13GP240 TV Chassis TX825TB.  Replaced TP15,DP02,TP11,TR03, the set still does not start up. Could I still have a bad transistor? 
Replace CP15=12UF,63V (black Panasonic) electrolytic capacitor it is the 8.5 supply filter coming from LP04=flyback x-fmr,located at corner of heatsink.

 

QUESTION NO. P1115-2:  RCA TV CTC177AH keeps blowing the fuse 5A.  U4101 STK730-010 have the pins 9,8 and 11,12 are shorted but everything else seems ok.  All diodes and transistors and the capacitors (CR4106, C4105, CR4109, D1878...).  Before I replaced U4101, any suggestions what caused it? 
I fixed a similar RCA using stk730-010 which kept blowing the fuse.  The ic was plain bad, replaced it and tv works fine.

 

QUESTION NO. P1015-3:  RCA CTC169BF TV.  Replaced shorted Q-4101(chopper output), shorted pin 16 & 15 of IC4101(reg) and an open fusible R-4001.  Played about half an hour and all three parts went out again. 
Check CR4108, CR4101, CR4118=RCA# 169590, CR4401=RCA# 198596.
If chopper transistor is going out that soon it must be running very hot.  If it is, replace the 39 uf @ 100v electrolytic that is between pin 14 of the IC and the base of the chopper transistor

 

QUESTION NO. P920-6:  RCA G32645K TV chassis CTC187CN3, the picture is bowed on both sides. 
Check the following pincushion components:
C4407=RCA # 214754=0.047UF,400v (rectangular blue colored cap)
CR4102=RCA# 164589=ECG 577 (7.5 v zener diode)
CR4403=RCA# 164589=ECG 577
CR4402=RCA# 164589=ECG 577
CR4701=RCA# 207878
For more info refer to the tv archived section of this website.

 

QUESTION NO. P920-8:  Toshiba CX2088K TV, the screen vertical sizing needs to be decreased. 
Replace two red/brown colored Elna brand electrolytic capacitors one located near the tv processor IC and the other near IC301=AN5515 vert o/p IC, on a similar model they are pcb locations C301 & C305.  For more info refer to the tv archived section of this website.

 

QUESTION NO. P910-7:  Sony KV-27HSR10 TV, the picture is narrower in middle than at top and bottom (almost hour-glass shaped).  Power supply filter caps O.K 
A loose connection on Q605 found in the power control circuit and is located on the G board.

 

QUESTION NO. P928-3:  Sony Kv27EXR25 TV.  Need value of R656 on power conv. board.  Replaced strs6301(pn874992081).  Hear high voltage but set goes into protection.  Relay(thp601) clicks and gets hot.  Fixed all cold solders. 
www.videotech.org/sony.htm 
(thp601) is not a relay, it is part of the degaussing circuit and normally runs hot.  It has nothing to do with power converter (even if they are on the same board).

 

QUESTION NO. P109-10:  Zenith tvy2021 combo has no vertical sweep.  Replaced vertical ic , there is -28v and 30 v lines, but no vcc on ic. 
Follow vcc pin of vertical IC back to a rectifier diode which is probably shorted along with a fuseable 1 ohm or so resistor connected between diode and flyback transformer.

 

QUESTION NO. P912-1:  Toshiba CF30E50 TV has a flat horizontal line.  Q404 (part number D2253) is shorted emitter to base.  What is the value?  Could the vertical IC cause it to short?  Should I replace both? 
Q404 is supposed to be shorted base to emitter because of the horizontal driver transformer being connected to impedance match the driver transistor to the output transistor,Q404.  The vertical output,feedback & filter electrolytic caps must be replaced along with the vertical output IC,IC301 note the caps also have the same prefix designation location as IC301,ex.C301,C302.  Common bad failure caps are two red/brown Elna brand caps I think C301=2.2UF,50v & C305=2.2UF,50v one located near color processor IC and one near IC301.Also check supply rectifier diode at vcc of IC301 and it's fuseable resistor which leads back to the flybak x-fmr.

 

QUESTION NO. P918-4:  Zenith 9-1427-01 TV is too bright and cannot be adjusted even on the G2 then it shuts down with black screen, but can hear static for about 5-10 seconds. 
Crt might be defective.

 

QUESTION NO. P919-10:  Zenith SY2568S TV burns the main fuse.  I changed QX 3401 RX3406 RX3408 ICX3431.  There is high current with my variac.  I do not find a short. 
Remove crt board, remove HV anode from flyback x-fmr, then remove yoke connector and see if short remains.  If so, crt might be shorted (green gun) which might have destroyed the flyback x-fmr.

 

QUESTION NO. P920-9:  Mitsubishi CS-2610C TV has a horizontal line.  Checked vertical o/p transistor o.k.
Replace vert electrolytic caps which have the same prefix as vert o/p ic,replace vert o/p ic,check supply diode for vcc of vert o/p ic and fuseable resistor connected to diode located near flyback x-fmr.

 

QUESTION NO. P924-9:  Toshiba CF2052A TV, Chassis Tac 9142 there is a thin horizontal line through the center of the screen.  It probably has defective filter caps in the vertical circuit but I cannot locate the vertical IC.
Replace vert electrolytic caps which have the same prefix as vert o/p ic and IC301=AN5515,along with two re/brown Elna brand caps.  I think they are C301=2.2UF,50v and C305=2.2UF,50v, one located near color processor and the other near IC301=AN5515, also check rectifier diode for vcc of IC301 and the fuseable resistor located at the supply diode near the flyback x-fmr.  Pot adjustment is located near vertical section or flyback x-fmr usually yellow colored pot.

 

QUESTION NO. P924-7:  Zenith SG5759S TV.  The module board 9-958 has no audio output in either internal or external settings, but the audio amplifier checks out OK. 
If unit has US Sony sound mplx decoder HIC (MTS) module, replace any with any of the following part #'s:  GenericSBX1637-11,SBX1637A-01/02,SBX1638A-01A, Sony8-746-371-10/11/20, Hitachi1381181, RCASKUP9102,201632, Zenith905-2321, GoldstarOIS0163702A, Sears Canada575251381181. 
Another solution discard tiny Sony sound module from board and replace with 2 caps(4.7UF,50v),pin 12 put + of each, and pin 10,pin 11 for -.

 

QUESTION NO. P924-1:  Hitachi C2146TN TV has no picture apart from very thin horizontal line in the middle. 
Replace electrolytic caps in vertical section along with vert o/p IC, they have the same prefix location as each other, check rectifier diode connected to vcc of vert o/p IC.  Also check fuseable resistor connected to diode located near flyback x-fmr.

 

QUESTION NO. P927-1:  GE 09GP223 TV Chassis CTC134A with no video, sound is ok.  The channel scanning line is moving across the screen looking for the stations, telling me there is H.V, and the tube is working. when it is tuned into a station with a little snow in it, the line usually squiggles with the snow (normal), BUT the line still squiggles with the snow, but no picture is present.  I think U1001 is defective.  The brightness, and contrast controls take no effect on the line, and no effect on bringing back the picture.
Resolder all connections inside the tuner box, and what I believe to be IF block.  Also check aged solder in power supply as well as flyback x-fmr.

 

QUESTION NO. P928-4:  GE 31GT740 TV chassis ctc203ca6.  Hourglass was intermittent, could be brought back by hitting cabinet.  It is now permanent in hour glass configuration. 
Solder RT4201K=degauss thermistor in power supply, solder the big filter capacitor in the power supply (about 100UF & up,200v).  Also resolder tuner & micro grounds and replace EEPROM IC as it became slowly deprogrammed due to intermittent solder.

 

QUESTION NO. P102-5:  Magnavox 25TR12 C221 TV chassis 25X601 00AA has a vertical roll with high voltage on vcc.  Have replaced IC with no help.  Checked voltage supply, seems ok. 
Replace C432=100UF,200v with 250v.  Also resolder components in power supply with visible signs of aged solder.

 

QUESTION NO. P103-9:  Electrohome 50CL03 TV, chassis XL-B-CSX1 has no vertical deflection.  I checked the IC and all caps I could find that seem to be associated. 
Replace all electrolytic caps in vertical section (they have the same prefix locations as the vert IC), with vertical output IC.  Also check the supply diode going to the vcc of the vert IC as well as the fusible resistor behind the diode leading to the flyback transformer.

 

QUESTION NO. P103-4:  Zenith sy2053s TV is dark, distorted and out of focus with white horizontal lines spaced one inch apart. 
The picture tube is defective, a very common problem with Zenith TV's.  Usually the picture is greenish and has bright retrace lines.  Call 1-800-243-0000.

 

QUESTION NO. P103-3:  GE 20GT324 TV, Rainbow pattern over black and white picture.  Picture is clear and sound is working fine but colors are in a circular pattern starting with a red band at the top then green, blue and a red band at the bottom. 
Solder RT4201K=degauss thermistor found in power supply near relay and ac power plug, another common problem found on RCA/GE tv's is slow EEPROM deprogramming due to intermittent tuner & micro grounding.  Therefore, tuner & micro grounds must be resoldered followed by replacing the EEPROM,RCA #217321.For more info refer to the archived tv section of this website.

 

QUESTION NO. P104-5:  Zenith SJ2722LK TV had green screen with 12 white Horizontal lines.  Replaced Q5106? video amp on crt board restored picture but colors are off and raster is green w/white lines.
The picture tube is defective, the green gun is shorted, a common problem (about 80% of all Zenith tv's) found on Zenith tv's,  Citizen TV's made by Zenith, some Zenith TV's have a 3 year warranty on the tube, call 1-800-243-000.  For more info refer to the archived tv section of this website.

 

QUESTION NO. P103-1:  I need the RCA part number for Q806 transistor (or ECG,NTE) for an RCA TV chassis # 159L. The Howard W. Sams # for this TV is 2754.
Q806 part#143804 called turn off transistor. drawing #1417340-003. ecg 123ap

 

QUESTION NO. P102-10:  RCA F19207BC TV,  I need a sub for BUH417D which shorted and damaged the fuse.  I need characteristics. 
BUH417D is a (discontinued) HOT with damper diode, rated 1700 Vcbo, 700 Vceo, 7 Amps, 50 Watts, from SGS Thomson.  BUH517D is a potential substitute.

 

QUESTION NO. P920-2:  Zenith SG-2795BG TV.  I need the source for a module number 9-700-18, repaired or new with chips on.
Make sure you have right board number then email pts@ptscorp.com.  They will replace or repair.

 

QUESTION NO. P924-6:  RCA TV Chassis CTC187AB.  The coax connector snapped clean off (P/N 215543).  I cannot locate a replacement housing.  Do I need to replace the entire board?  What is the board's part number if I need to replace it?
You noted the correct part number for the replacement connector.  RCA does not supply replacement cans, but connector is designed to be replaced.  Just unsolder the remnants of the old one.

 

QUESTION NO. P924-4:  Sony kv-14bmp1/yc TV jungle ic-cxa1213bs/micro-m34302m8-717sp. The unit had b+ (115vdc)BUT will not power on.  No voltage present at pin27 of jungle ic but with 9v vcc at pin25. R563/180k is ok where it is commonly found defective in other units.  No horizontal oscillation in q801 w/c drive the horizontal trans w/c is also connected to horizontal out transistor Q802.  I swapped the jungle ic and found that it is good. 
Change the micro-p.

 

QUESTION NO. P914-1:  Technica K3910 (AC/DC) TV has lost picture & sound.  Before this happened, the set showed hum bars and bending of picture as well as the picture going bright-dim every second or so.  Fuse also blew when this happened.  I suspect the low voltage regulator but am unable to get a part number.  Rectifier bridge and all power supply caps have been replaced.  What should the output of this regulator be and/or the part number?  The output now is about 2.9 VDC. Regulator is large with a big heat sink.  This set also has been sold as an AIKO CTV AT1000R, Hanamex CTV 10, Masuda T1092 and a Tempest TE10RM. 
The output is 10.3 volts.

 

QUESTION NO. P97-10:  RCA F25422 TV.  I need the value of q14101 on the power supply. 
RCA part # 244223.

 

QUESTION NO. P828-4:  Sony KV-1985 GET TV has no power.  There is 135 V output measured at H.Outout D 1877 transistor.  I can get 0.9 V at CXA-1213 pin 26.  Sometimes I get 9.0 V.  Is the CXA-1213 IC faulty? 
Check:  memory ic faulty.[24c02], reset ic faulty.[LR05], dry sold around fly back+power supply, driver transistor collector voltage not present [95v], regulator ic 7805 & 7812 faulty, clean ic cxa1213.remove from pcb & wash with wd-40, rep D1878, rep cxa 1213.

 

QUESTION NO. P914-10:  CTC-177af2 TV has poor channel reception.  Soldered the tuner and problem was solved but now it has poor colors.  I tried to adjust them in the menu with no luck.  Is it the EEprom? 
Check the thermistor in the degaussing circuit.

 

QUESTION NO. P911-8:  GE 27GT600 TV chassis CTC177BP2, I need flyback part number. 
It is not listed in my RCA CTC177 part list.  Check with your RCA distributor.

 

QUESTION NO. P97-4:  Sharp 25j-m100 TV.  I need the value of R466. 
R466 0.27 ohm 1W.

 

QUESTION NO. P831-1:  Mitsubishi CS-35301 TV loses vertical hold.  I changed tuner, some filters and some ICs besides the tuner. 
Does this model have PIP ( Picture-In-Picture ) ? If so, the trouble is leaky surface-mount electrolytic caps on the PIP board, especially any 4.7uf and 10uf components. Look carefully under these caps for corrosion/trace damage.  Best way to test them is with an ESR meter, or replace ALL of them! ( Sync, both vert. and horiz., goes through the PIP board at all times, regardless of the PIP function being used or not. )

 

QUESTION NO. P831-1:  Mitsubishi CS-35301 TV loses vertical hold.  I changed tuner, some filters and some ICs besides the tuner. 
Does this model have PIP ( Picture-In-Picture ) ? If so, the trouble is leaky surface-mount electrolytic caps on the PIP board, especially any 4.7uf and 10uf components. Look carefully under these caps for corrosion/trace damage.  Best way to test them is with an ESR meter, or replace ALL of them! ( Sync, both vert. and horiz., goes through the PIP board at all times, regardless of the PIP function being used or not. )

 

QUESTION NO. P823-10:  JC Penny 685-4120 TV will have a perfect picture one second then the screen turns blue with faint horizontal lines.  It will stay blue a while then return to a picture, the audio is always consistent. 
If it is a bright blue pix with retrace lines then the problem is most likely a heater to cathode short on the blue gun of the crt.  You can be sure by tapping on the neck lightly.  Problem can be solved by installing an isolation transformer booster available from most parts places.

 

QUESTION NO. P823-5:  Magnavox TV chassis 26g1-01 keeps shorting horiz. output. 
If you have checked things in the drive circuit like the decoupling cap in the primary of the drive transformer, then make sure the transistor is the exact part from the factory.  I have had cases where the horiz out runs hot or blows after a short while only to find out the transistor was a counterfeit.  They look like the real thing and have the same number on them but are bad.  I am selective of the vendors I use but once in a while even a good vendor can come up with a bad part.

 

QUESTION NO. P81-6:  Sony KV-27V15 TV.  I need the value of R687. 
R687 6.8 ohms 5% 1W Nonflammable Sony part # 1-216-359-00 NTE part # 1w6d8.

 

QUESTION NO. P827-4:  Sanyo CAP621 TX TV has no picture but good audio.  The set is using LA7680 chip as it's VIF,SIF and chroma processor.  I measured LA7680 pin 21,22 and 23, the voltages 1.3 V. 
The output voltage at pin 21, 22 and 23 must be 5.5 V.  Therefore, LA 7680 IC is faulty.

 

QUESTION NO. P89-3:  Sharp 27j-s100 TV.  The vertical ic burn't out.  The replacement corrects the set 100% but gets very hot and burns out after a couple days of use. 
The deflection yoke/coil is shorted, common problem with Sharp's 27" series tv's.

 

QUESTION NO. P821-6:  Zenith SG2710TR TV.  The audio level continues to decrease. The volume control has to be at 100% in order to hear anything. 
Replace the MPLX Sony sound decoder module.  The equivalent part #'s are as follows:  Sony SBX1637-11, SBX1637A-01/02, SBX1638A-01A, 8-746-371-10, 8-746-371-11, 8-746-371-20, Hitachi1381181, RCASKUP9102, 201632, Zenith905-2321, GoldstarOIS0163702A.

 

QUESTION NO. P820-2:  Sanyo DS25380 TV detunes about once each second.  Tuner, saw filter and both coils subbed with no help. 
I think there is no AFT signal from i.f board.  Check for dry soldering of this area.  Also check horizontal IC for dry sold.  Now check AFT volt on i.f control IC [0v to 8v] on tuning process.  Last check AFT volt on system control IC [0v to 2.5v]to lock tuning. [imr]

 

QUESTION NO. P817-8:  Samsung vm6405 TV/VCR dead but has a high pitch oscillator sound. 
Check the horizontal output transistor rep [D1878] & also check for dry solder around the horizontal output. 
Check and replace c810 to stop squeal.

 

QUESTION NO. P817-10:  Zenith SRV1304S TV/VCR is dead. The fuse is not blown.  Upon connection to power there is a small chirp as the switch mode supply cycles once it seems.  The dc voltage is ok to the primary switch mode transistor, I believe they use an fet type in this device.  I cold checked all the primary caps and diodes and found nothing.  I made a cursory check of the secondary diodes to see if something is pulling the supply down and not allowing it to oscillate, and again nothing. 
There is a 6 volt regulator on the power supply board, a KIA7806.  It goes bad and only puts out about 2-3volts on startup.  This will cause the set to go into a shutdown mode and the power supply appears to be dead.

 

QUESTION NO. P810-8:  Sony kv m25 11 l TV.  Originally it took a long time for picture to appear until eventually it did not appear at all.  When turned on, a horizontal line appears high up on the screen for a few seconds.  When switched off, pink lines appear.  Checked for and resoldered a few dry joints, no improvement.  The frame output transistor appears to be ok. 
Probably the G2 voltage is not ok.

 

QUESTION NO. P726-5:  Nec ct-2501 TV is blank except for single horizontal line in the center.  Leads from the yoke go to a 6 contact connector and there is no ic nearby.  Is there a transistor or ic that controls the vertical?  What is the number/location of the ic/transistor? 
Found open diode at D-503.  I noticed some soot on the flyback and checked the surrounding components.  I replaced the D-505, that had a crack in it, as well as the adjoining resistor and cap.

 

QUESTION NO. P712-7:  Sony KV-1440ME 2A TV has a thin horizontal line through the middle of the screen.  The sound is clear, but there is no picture. 
Check the vertical deflection circuit (supply and output circuitry).

 

QUESTION NO. P711-8:  RCA F32676 SB TV Chassis CTC 197 CD, tries to come on but shuts off a second after power switch is pushed.  The 145v is present and the other voltages appear OK.  There is a horizontal waveform momentarily at the base of Horizontal output transistor and on the collector.  Output transistor checks ok and the diodes coming off the flyback are ok.
From what I have seen so far with this set, you are describing a FBT failure. Two of the ones I have fixed had no visible damage, but did not work. Two had holes burned in them. At the time of this writing, I have 5 on backorder from my supplier for this identical problem. RCA P/N 237506. RCA has told my distributor they will not ship this item until late August. Do not be surprised if you also have to change the HOT also after changing the FBT.

 

QUESTION NO. P724-1:  Mitsubishi VS-47r TV has no picture.  We checked all the fuses and all of the boards, none were blown.  It seems like higher voltage circuit for the guns is missing. 
Replace C7001 & C7001 both are 47uf,35v located in the pip board.  Also replace other surface mounted electrolytics in the pip board.  For more info refer to the archived section where many Mitsubishi tv's have this problem.

 

QUESTION NO. P726-8:  RCA TV chassis CTC 169as.  I need the part number for the horz. output transistor Q401. 
Q401 is a 2sd1885.

 

QUESTION NO. P724-10:  Panasonic ct27g30t TV chassis amedp246 was dead with blown fuse.  Changed out stk-730-020 and Hot bu2508df (substituted with 2sc5250).  Now it does not blow fuse but will not come up either.  Placed series light (150w bulb) in B+ circuit, measured around 153Vdc, light stays bright seems like a short , checked everything in power supply circuit, seems ok. 
I recently repaired a Panasonic with a similar chassis (AEDP224), I replaced the HOT Q551 (BU2508DFLB), and it blew after 5 minutes, I suspected a leaky Cap, but I had no equipment to measure leaky Caps, I replaced 3 components D558 (RS3FS), C564 (.0039 1.2kv) and C565 (.0012 2kv) and that fixed the HOT problem. All three components were mounted next to each other on the PCB with a slot (air gap to minimize arcs) cut in the PCB between both legs of each component.

 

QUESTION NO. P75-6:  Philips 14CE1002 TV forgets the preset channels after having been turned off for a while. 
Check the Memory backup battery NiCd 2,4V/90mAh. (code 4822.138.10229).  This Philips chassis CP90 and CP110 are known for this problem but normally you should also loose sound and color presets together with the tuner presets.  If you don't, then take a look at the TMP47C432-8XXX ucontroller backup voltage pin or replace this chip because it could also have a memory problem.  If you replace the TMP and if the TV is equipped with a Teletext option, pay attention to the 8188 or 8189 version which defines the Teletext firmware.

 

QUESTION NO. P613-7:  RCA Proscan PS31122 TV, Chassis CTC169EJ5 horizontal deflection problem , the picture is only 1/4 of an inch wide in the middle of screen but alright on vertical from top to bottom , color and sound OK. 
Looks like a pincushion problem.  Possibly bulged blue or gray capacitors (changed value).  Also could be leaky diodes in pincushion circuit.  Another possibility is bad yoke to main board connections (solder). 
Replace the blue rectangular box cap (.48microF at 250V. I used a .47 ) in horizontal circuit.

 

QUESTION NO. P618-2:  Zenith sj2765w TV came in with no power, had blown fuse.  Replaced fuse and when plugged up Q3431 popped, replaced with another and it popped also.  The transistor is 1264, what does this cross to in NTE? 
Cause for blowing q3431 is probably shorted i3431 regulator ic.  Common cause for power supply blowing is intermittent shorting crt.

 

QUESTION NO. P525-8:  Blown line output transistor in Sony KV-25R2D TV.  I replaced the original S2055N with a BU508DF.  After about 2 1/2 hours it blew again. The cooling plate gets quite hot, which might cause the breakdown of this part.  But the picture is normal when operating, though after a while the picture sometimes "twitches in" horizontally.  Is the power supply voltage too high, or another fault in the power supply? 
Your first problem is you used a sub on a Sony TV, Trust me, NEVER sub high voltage or power supply parts on a Sony TV, use Sony replacement parts and life will be good, be SURE to use heat sink compound on the new transistor!! I learned the hard way too, use Sony parts in a Sony and it will work.

 

QUESTION NO. P612-3:  Sony KV-DX27 1TU TV.  I need the value of R807 (HDEF) as it is burnt.  What likely caused this to burn-out? 
D803 RPG02-17 Diode - Sony P/No 8-719-976-64 and is the likely cause of R807 failure/burnout.  Change together.

 

QUESTION NO. P517-6:  Goldstar gct2004s TV has a very low sound.  Has a Sony audio board seen a lot in parts catalogs but it looks different.  Are they the same part? 
Yes they are all the same, some use 8-caps while others use 10 caps the equivalent part #'s are as follows:  SonySBX1637-11, SBX1637A-01/02, SBX1638A-01A, 8-746-371-10, 8-746-371-11, 8-746-371-20, Hitachi1381181, RCASKUP9102, 201632, Zenith905-2321, GoldstarOIS0163702A, Toshiba?, JVC?, Citizen?

 

QUESTION NO. P525-4:  Sanyo DS25430 TV.  I need the values of R008 and R009. 
Q402=2SD1879(ECG2331), R008=220 ohm, 10w (Sanyo #402 060 4606), R009=220 ohm, 10w (Sanyo #402 060 4606), R473=6.8 ohm, 8w (Sanyo #402 067 8201).

 

QUESTION NO. P531-9:  RCA CTC175A TV does not turn on.  I replaced eeprom.  The set turns on but all the tuner alignment data in the old eeprom are lost.  I do not have a tuner alignment generator. 
www.electronicsaid.com then click on "RCA EEPROMS" and use the average values given for your chassis. 
You have three options, re-install the old eeprom and write down all the parameters to enter into the new eeprom, buy a pre-programmed eeprom, take it to a shop that works on RCA`s.

 

QUESTION NO. P65-7:  Sanyo AVM-1903 TV, chassis # G4519030 with what appears to be a programming fault.  On turn on, the tv goes into demo mode and cycles through all the parameters of brightness, color, tint, channel select etc.  This continues indefinitly.  I suspect the eeprom needs to be reset, but how? 
Press and hold "Demo" button for 5 seconds or until the demo has disappeared, nothing wrong with EEPROM or micro.
Try pushing and holding in the menu button for up to 10 seconds.

 

QUESTION NO. P61-6:  Sharp 19EM40R TV chassis 7921VO, has bad controller IC, Sharp X2157CEN3.  Cannot find part or cross ref.
There is no sub for this IC to my knowledge.  Use original.

 

QUESTION NO. P61-10:  Mitsubishi CS-27303c TV has a problem with the vertical hold.  I look on the scope at the pin 28 (vertical out) of the LA7674.  When the trouble appears instead of having one peak I have like six. 
The problem was c7001 (4.7uf 35v) that leaked on the PIP board.

 

QUESTION NO. P521-5:  I need a part # for Q3431 for a Citizen jctv 3402 TV. 
The part # is 121-1264-01a.  This is a zenith chassis.  Check icx3431-probably shorted-also 47ohm resistor open - cause crt.- int. short

 

QUESTION NO. P516-2:  RCA TV CTC 140 chassis when powered up cold, there is vertical roll and some horizontal distortion on text.  Once the set is warmed up, it operates normally.  I suspected a bad C4301 cap on pin 7 of U4300 deflection IC, but changing that did not solve the problem.  I also changed the power supply cap C4708 on the 17V supply with no results. 
Cold spray in sync/oscillator circuit.  After set is warm should find fault- probably small electrolytic cap.  Also check low voltage supplies.

 

QUESTION NO. P521-8:  RCA TV 169 chassis has retrace lines and brighter than normal ,appears on all three tubes. 
Check the 200 volt supply from flyback - if low or missing can cause retrace lines.  It is supply voltage for video output transistors.  Also check luminance buffer transistor.

 

QUESTION NO. P57-10:  Toshiba 2506XH TV, IC801 (8-pin DIP) is missing from PCB board, I need the part number. 
IC 801 is not an 8-pin DIP. It was 5-pin SIP and the part # STR 81145.

 

QUESTION NO. P58-7:  Toshiba 2506XH TV.  Need part number for IC807 (8-pin dip). Part was missing in the board which was earlier repaired by another technician. 
Part number was TEA 5170.

 

QUESTION NO. P523-3:  RCA CTC 197CD TV would not come on, replaced IHVT.  Set comes on now but menu button on front panel does not bring menu up.  I can enter the service menu by pressing menu, power, vol +. so I do know that the menu button is physically making connection.  It just will not display the customer adjust menu. 
This sounds like a typical eeprom problem.

 

QUESTION NO. P522-10:  Philips TV chassis 25f 800, no power /and from my findings look like no start-up.  A semi-conductor marked as[ 7601] on the silkscreen and has 6 pins and is marked as [tcdt1101g] the only voltage is on {pins 4} -34vdc, pin5}-26vdc, there is no other voltages measured on the other pins.  What is the function of this component? 
This device is a phototransistor-output optocoupler, made by Vishay.  You need to have a voltage applied across the LED (pins 1 & 2), to get phototransistor conduction from pins 5 to 4.  For more information on this device, download the datasheet from www.vishay.com/docs/tcdt1100.pdf for this Vishay optocoupler series.

 

QUESTION NO. P426-5:  Grunidg CUC 3410 TV emits a nearly unnoticeable high frequency sound (this is normal I think), but there is no sound nor picture.  Led display work well and there is a clicking sound coming from the speaker (this sound stops when pressing volume control button). 
Replace HOT driver TDA 8140 and cap 220u/40v near him.

 

QUESTION NO. P518-6:  Sony kv-27tx10 TV, the colors were all in wrong places.  Resodered thermistor solved problem, but there is a greenish tint on the screen.  How do I set gray scale tracking to get rid of green? 
Answering my own question, I turned the color control off and was still greenish.  I marked the screendrivers on the kine board and turned the blue counter clockwise real slow til screen was white then turned color up - greenish tint gone.

 

QUESTION NO. P515-7:  Magnavox bc3910sl01 TV , the video was flashing and then went out to no picture.  I changed most of the transistors [no help]. cleaned brown glue from circuit [no help]. uhf tuner will not feed if through vhf tuner either. uhf works if it is connected direct to vhf tuners' if out.  Also works with sub tuner from another tv.
The problem was located in vhf tuner c17[8pf] located in base circuit of tr3 [2sc1394].I replaced with 10pf cap.  This cap c17 was leaky shorting base circuit to non conduction.  Also carefully clean most of the brown glue off components [pick off].

 

QUESTION NO. P57-3:  RCA CTC 146 TV, on high brightness scenes darker bars come in from left side of screen (horizontally not jail bars).  The picture can pulse but when scene darkens picture returns to normal.  If the screen control is turned down the problem stops but at a point where the picture is just to dark for good viewing. 
Depending on which model you have, check R 2715 for an increase in value, resistor should be a 113K or a 158K, if it is bad it will go up in value to as high as 750K, also check R 2727 should be a 3900 ohm, it may have also gone up in value.

 

QUESTION NO. P53-5:  Toshiba CL20G22 TV chassis TAC9702 dead.  Main fuse blown.  Found R899 which is a dual diode shorted burned causing a short circuit.  Unable to read any reference number (part number, value, etc) on it. 
Answering my own question, part was a 110v rated varistor.  Replaced and working fine. No other part except main fuse was affected.

 

QUESTION NO. P430-1:  RCA CTC 175A-F F20301S-F TV has intermittent loss of picture and sound, usually a slow progressive deterioration and sometimes collapsing raster with red screen, most noticeable on higher channels.  Will operate sometimes for a day or more and then repeat same sequence over. 
These are classic symptoms of the infamous "tuner wrap" problem in CTC 175, 176, 177, 184, 186, 188 and to a lesser degree in CTC 185.  This is a grounding problem that occurs because the circuit board was designed without a proper ground plane or trace structure, and the main ground for the set is distributed through the tuner and microprocessor shields.  The fix is outlined in Thomson service bulletin 96-005.  You must also order special materials S-KIT-1 (Indium based solder and special flux) from your distributor to insure a long lasting repair.  The repair involves soldering a number of connections inside the tuner (the inner ones with the special solder) and the outer ones with regular solder, resoldering the microprocessor and pip shields, and resoldering both ends of white wire E16 which starts near the tuner and goes toward the front of the chassis.  The tuner must also be grounded with braid to the near end of this wire. Check all the values in the EEPROM after the repair, as the lack of grounding can overwrite values.  Also look for missing (or added) features, as the feature word or indeed any part of the control program can be also overwritten.  Frequently the code that controls the speaker mute line is corrupted causing very low value sound, but an amazing array of failures can occur. Replace the EEPROM and realign all chassis parameters if in doubt. To save time, you may copy the old data on paper to start with and then adjust any values needed.

 

QUESTION NO. P430-7:  Zenith Sentry 2 model SMS2053S TV has a horizontal white line in middle of black screen.  Looks like vertical hold problem.  I noticed in archives, lots of Zenith models with picture tube problems. Is this what I'm looking at or could it be a component on the board?  This model has 1 board.  No visible sign of burned components. T.V. is only 5 years old. 
A white horizontal line centered on a black screen in most cases is caused by a bad cap or caps in the vicinity of the vertical driver IC or the IC itself.  Some sets, however, have an onboard switch for service.  Accidentally changing its position will cause the same symptoms.

 

QUESTION NO. P44-5:  Mitsubishi CS3535R TV has no video or audio, only menu display and channel numbers can be seen. 
It looks like the tuner is defect.  Does this TV have a scart input?  Try that one and when all is ok, it's quite sure that the tuner is defect.

 

QUESTION NO. P418-1:  Philips 21GR2350 TV has image but no sound.  I replaced TDA 8191 with TDA 8190 but still no sound (with external source like VCR I got both image and sound). 
It looks like the problem is situated is the demodulator, which is mostly placed inside the tuner, when using a scart input this circuit is bypassed so this problem will not occur.  Advise replace tuner.

 

QUESTION NO. P412-5:  Quasar QC-29F20S TV chassis YAEDC204 has horizontal white in center that is centered perfectly but spans only 60% across the middle.  There is a faint hiss from the speakers but no volume.  There appears to be data when menu is pushed.  Vertical section components appear to test good. 
Both Quasar and Panasonic later model tv's are very prone to bad solder on the vertical module connections.  Could also have bad capacitor in vertical circuit.  Sometimes vertical IC fails.  As far as the set not having audio I suspect you may not be in TV mode.  Fix vertical problem first, then see what is left.

 

QUESTION NO. P420-5:  Sony KV32S35 TV shorted Q601, 602, 502, and R607 open.  I replaced all transistors with original from Sony and the VDR601, and R607, I also resoldered the flyback.  After replaced the parts the set did not turn on and the same parts shorted again. 
Double check solder connections in horizontal driver circuit.  If the HOT shorted, this is path most likely.  Also have found small resistors in e-b junction on HOT have changed value.

 

QUESTION NO. P417-9:  Samsung tc9895tb TV keeps blowing fuse.  Changed flyback, hot, voltage reg, and vert amp.  Still blows.  When remove yoke connector does not blow.  Yoke checks out fine. Remove vert. ic. doesn't blow fuse either.  Same as hot remove it does not blow.  Soon as any of these components are replaced, the fuse automatically blows. 
To stop blowing fuses, use a light bulb as a series load.  If the bulb lights and go down to a normal intensity then you do not have a short.  If it flashes, then you have a short.  Check the bridge rectifiers, generally Samsung TV use B12 or 1N4007 as rectifiers.  Usually if one is shorted then another one is shorted.  If this does not solve the problem, look if the main cap (usually the biggest one) charges and discharges by applying continuity with the DMM.

 

QUESTION NO. P425-1:  Mitsubishi cs-35301 TV, vertical chip i.c. 401 la7838 burned out.  I replaced r9610 that powers the chip.  TV may run up to two weeks and then when turned off or on it burns the chip out.  Pin #12 vertical out goes to ground?  Have replaced the chip at least 10 times.  The yoke winding has a resistance of 9.8 ohm, is that right? 
Check the electrolytic capacitors in the vertical section.  There are a couple of 100uf/35v caps that go bad right by the vertical output chip.  There are also a few electrolytic capacitors on the power supply board that go bad.  A good ESR meter is worth its weight in gold for finding these.

 

QUESTION NO. P424-2:  Zenith SL7784BT TV has no picture, no HV, sound is ok . Customer smelled smoke, no apparent cooked components. 
Check CR3412 for bad solder connection.  Many times when this opens FX3403 will open and sometimes QX3208 shorts.

 

QUESTION NO. P419-9:  Sony KV-27S35 TV.  I need a source, type and part number for R607( 0.1 Ohm 1/2 Watt) and C615(0.039UF 630V). 
Try Electro Sound 800-441-6110, part number 1-202-933-61/11.

 

QUESTION NO. P328-10:  CTC 187ch3/6 TV previously the set started shutting down intermittently.  Then the set went dead with a high pitch noise.  Found that the HOT was shorted between base and emmitter.  Further checking found R4402 is 3.7 ohms. I need the value.. The resistor go to pin 10 of the CRT soc.
The resistor you are looking for is R3343 with value of 5100 2% and 1/4 Watt.

 

QUESTION NO. P329-1:  RCA CTC 187 TV blows H.O.T.  Already replaced associated diodes and caps in horiz. section. B+ is fine.
If it keep blowing the Horizontal Transistor you are probably dealing with problems on the Horizontal driver section.  Check for tiny cracks on each joint, if it not properly connected your H.O.T. will go in seconds

 

QUESTION NO. P45-4:  Magnavox TV chassis 25S102 would not shut off then went dead.  R432 was burnt and Q502 was shorted.  I changed these and IC430, C432 ,Q400, Q402, Q403, Q405 R407, IC350.  Set still will not turn on. 
Check collector voltage on horizontal output transistor, if not approx. 130 volts, check the pico fuse it`s open.  Also check pin 2 & 4 of IC 430.  If they read approx. 65 volts then Q403 is probably running hot.  Replace R435 it is either open or has gone way up in value, R435 is a 130K ohm 1/2 watt.

 

QUESTION NO. P410-4:  Sony-KV-27XRB TV there was a clicking sound for a few seconds then one exploding sound.  Now the FBT crashes (air sound) continuously, and I measure 33Kv at HV.  If I let the set in, high voltage drops very high.  There are no parts burned!  I replace the FBT ,and same problems.  I also need the voltage measurement at HV, FV (focus), G2. 
You need to take your set into a reputable shop and get an estimate on the repair, the High Voltage on your set is lethal and non-techni