TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	STRVX4	Missing part number - c803	I need the part numbers for the filter caps designated c803,c804 in the service manual. see page 35 section q4. they filter thebridge diodes output. i have a unit s/n 860295 which had both capacitorsexhibit leakage on the main power board. sample inc
SONY	KV1554R	Smoking r613	As soon as master power switch s901 was turned on, r613 wouldsmoke. tv also would not start up when power switch s001 was pushed.bridging ry601 contacts stopped resistor from smoking, and set appearedto work normally.
SONY	XRM10	Errors in mounting diagrams of service manual	Page 17 (former type) and page 29 (new type) have numerouswire label errors and wiring errors. i noticed these when recently i hadto reconstruct a burned out wire bundle. see attached sheet. note thatcnj321 (i have labeled it for its jack color) can b
SONY	KV1916	Board showing wrong direction for a diode	Set came in damaged by lightening. audio circuit was wipedout so servicer replaced all components in audio circuit. after finishingvolume was wide open and would not turn down.
SONY	KV25XBR	No sound, replaced ic103	No sound when in the tv mode, found no switching (high, low)on ic103, pins 36 and 37.
SONY	KV2657R	Vertical rolling	After set warms up (approx. 1 to 2 hours), set would havevertical problems, rolling and eventually vertical collapse.
SONY	BMC220	Tension regulator arm p/n	Need part # for tension regulator arm shown on page 100 ofs/m. -hq comments: part number is x-3681-493-2. this information is coveredin s/b 221 (12/6/85).
SONY	KV25XBR	No raster - locked in sleep mode and rgb mode	No raster, set locked in sleep mode and rgb mode.
SONY	KV2680R	Vertical jitter when hooked up to satellite, short r-859	Vertical jitter when hooked up to a satellite.
SONY	KV1747R	No tuning	No tuning. -hq comments: we sent you the area waveforms which should be helpfulin troubleshooting. you should be getting sinewave w at pin 1/cp003from local oscillator in the tuner. its amplitude should approx. 70mv.it gets amplified by ic006 to 0.7vp
SONY	TAAX205	Wrong part number - ic301	Wrong part number for stk4191 in s/m, should be 8-749-941-91. -hq comments: we will issue a s/b.
SONY	SL5000	Drum or capstan servo instability	A large number of the 5000 series betamax using the solidelectrolytic capacitors in servo circuits are having problem. the mostcommon failures are c007/c008/c010/c011/c016/c044/c050/c054/c063 on ss-9board.
SONY	SL8200	Ac motor	The ac motor became very noisy. replaced it with the onep/n 8-839-018-00. this ac motor was turning backwards. p/n 8-839-018-00is replaced by 8-839-018-10. p/n a-6737-079-a fixed the problem. thep/n from s/b no. 14 could also be used. -hq comments:
SONY	TC850	No aps delay between fw and play, breaks tapes	When using aps, unit should go into reverse fw mode to stoptape, wait for a moment, then engage play. the delay did not occur, andunit went directly into play from fw, breaking tape.
SONY	XR20	Intermittent audio output	Sound cuts out momentarily on radio or tape when accessoriesare first turned on (actuating blower, lights, brakes, etc.). kills soundfor a second without affecting dial lights. also occurs if engine isrevved up to 1200 rpm or so while in neutral. foll
SONY	KV1965	Pix bend, troubleshooting suggestion	Bend in picture. it can be changed by brightness, but noteliminated. also slight bow in edge of picture, pin adj. does help butdifficult to get straight if not impossible. customer is not complainingabout above described problem. -hq comments: the di
SONY	KV1770R	Wavy vertical bars, left side of screen	With antenna connected, wavy stripes similar to those causedby cable ingress appear on left side of screen. with no antenna, signalis snowy and weak, but shows no evidence of vertical artifacts. hit asswas replaced, with no effect. cable assΩmeter.
SONY	CDP302	Skipping	Skipping. found on an older unit s/n 804653. everything wasthe same except te was lower in amplitude 0.78vpp vesus 1.1vpp in thenewer units. is there a procedure for adj. laser output?
SONY	PSX50	Intermittent tracking	Found anti-skate pin too long and was rubbing against baseassy.
SONY	SL2700	Shutdown from any mode	After inserting tape, pressing any mode switch unit wouldshutdown in approx. 10 to 20 seconds. take-up reel would turn slowly ornot at all. pinch solenoid operation may also be erratic.