TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	STRAV460	No output when in tuner mode/no station memory	All functions worked except no audio output when in tunermode. unit would tune all stations but stereo indicator never came on.found pin 15 ic202 (mpx) was about 2.5v all times. lifted d204 and audiocame up and stereo indication returned. found ic301
SONY	SLHF900	No cue/review	Cue/review inoperative. audio mutes and capstan speedincreases slightly. noticed c/r signal at base of q523 (ss-53 board)would toggle, but no change at collector.
SONY	CDP302	Distorted sound	Distorted sound, but tracking is ok, time display normal amsand scan ok.
SONY	SLHF600	Herringbone pattern in picture	Herringbone pattern in e-e signal. complaint on w.o. statedonly occurred when cold. we noticed that it was actually sensitive tomechanical shock. tapping ps-39 board would cause problem to come and go.
SONY	AVH55ES	No video out on video 1 and 2	No video monitor out when switched to video 1 or video 2. v3,v4, tv all ok.
SONY	SLHF450	Tape plays but no video	No video and r309 (va-14 board) overheats, no 5v on q64.measured a short on pin 2 of cn8.
SONY	CCDV8AFU	No capstan phase lock	Noise bar at 5 sec rate. observed rf envelope expand to maxand diminish. by substituting atf servo with power supply could stabilizepicture. all signals at atf servo/ic106 appeared ok, but replacementsolved problem. hint: wait for rf envelope to dimi
SONY	KPR4110	Unit shuts down, replaced r-217 (e board)	The unit would begin to power up and then immediately shutdown. we discovered that the problem was premature hv shut down. it wasbeing caused by r-217 being the incorrect value. there was a 33kinstalled. 20k provided correct bias and allowed normal o
SONY	AVU270	No low stations	The unit operated correctly except that it was not possible totune in the low stations. eg. fm/below 94mhz, am/below 1020khz and tv/below #5.
SONY	KV2665	Intermittent vertical jitter with movie tape, remove q-854	When playing back prerecorded movies with copyguard the tele-vision would have an intermittent vertical jitter. all other modes workedfine - off air, generator, etc. by examining the sync in the delayed modeon the scope we determined that the vert. syn
SONY	CCDV8AFU	Video was good but everything was pink	Video was good but everything was pink. traced problem tome-1 board. good signal tp703. no signal tp704. signal ok pin 48 butdc voltage 4.8v. trace to leaky chip cap c711.
SONY	ITA600	Radio interference	Customer hears local radio stations over phone. hears 980 amand 610 am at the same time. worse when plugged into ac line. -hq comments: the rf interference is more than likely am. a choke coil(same as is used in spp-300) will soon be available from k
SONY	EVS700U	Sticky drum assembly	Drum does not start after unit is not used for several hours.
SONY	CCDV8AFU	No power	No power, all voltages normal out of dr901, vdd normal toic601. found no clock at ic601.
SONY	CCDV8AFU	Tape hesitates	Intermittent tape hesitation during tape run record or pb.momentary tape stoppage at random intervals progressing to emergency stopalthough normal immediately after reset, continue operation finallyobtaining complete failure of tape movement in all modes
SONY	CCDV8AFU	Won't record	Won't record, unable to enter any mode except eject, drum runfollowed by emergency stop. found no rf sw pulse pin 24 ic601/mc-4 board.no output pin 7 ic501 on mc-4 board, incorrect dc level pin 6 ic501.
SONY	CCDV8AFU	No function	No function. power up normal. found no motor power.
SONY	CCDV8AFU	Flicker	Flickers during playback and record, intermittent shift to four hour mode. found high frequency signal and noise present on 5 lines, variable with stress applied to dc-dc converter.
SONY	BMC660	Cassette compartment won	Cassette compartment will not catch.
SONY	FD2A	No raster, shorted electrolytics c209, c215, c611	No raster, no sound. found one or more of the aboveelectrolytics shorted.