TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	SPP320	Poor audio connection on telephone line	Poor connection with outside line. audio and dial tone barelyaudible or nonexistant both in and out.
SONY	D77	No audio	No audio due to loss of -4.7vdc at q-405 collector.
SONY	CDP590	High failure rate of ic-102	Have seen many of these ics fail in various models. they getvery hot and removal is difficult.
SONY	CDP190	High failure rate of ic-102	Have seen many of these ics fail in various models. they getvery hot and removal is difficult. sometimes the pcb traces are damagedby the heat which means the pcb must be replaced.
SONY	CCDTR5	No color record	Camera had no recorded chroma - all other modes had color.found l-502 in the chroma convert circuit - circuit on the vc-60 boardopen (little tiny part). no part in kansas city parts - pulled fromscrap. -hq comments: with l-502 open, the 743khz chroma c
SONY	CDXR77	Display pcb dislodged	Display pcb becomes unseated from plastic clips that holdlower edge causing no operation of several buttons on front panel.
SONY	EVC8U	Snowy picture every two or three seconds	Every 2 or 3 seconds the picture would become snowy. soundremained ok.
SONY	KV27TX20	Distorted picture, solder if block if-201	Both normal and pip had what looked like agc overload perservicer. output from video input was good. bypassing antenna switch didnot correct the problem. prior to subbing tuner, unit began to operatenormal. tapping on if block indicates loose connect
SONY	KV20EXR10	Red retrace lines appear on the screen, replaced ic-701	On tv mode and video mode, red retrace lines appear on the screen. the lines more visible on video mode and no signal connected condition.
SONY	SPP120	Handset changes channels on its own	After hand unit and base establish contact, the hand unitcycles to the next higher channel about every 12 seconds (just as itwould if the channel button were pushed). also applies to s/n 12352.
SONY	KPR41DS2	Unpredictable display-using front power on switch, d5020	Customer could turn on power with remote hand unit and setwould function normally. if set was turned on at front panel switch, unitwould come on in the following mode: vol..full, sap, all customer controls(color, bright, etc...) all the way up, and in v
SONY	CCDF77	Part number for microphone windscreen/use x-2536-720-1	What is the part number of the microphone windscreen? -hq comments: part number is x-2536-720-1
SONY	ICF7700	No short wave reception	No short wave reception.
SONY	D25	Disc spins - spins backwards - shutsdown	After pressing play, disc would spin and you would hear focussearch. the disc then spins backwards very fast and unit will shut-off.i have had this part go bad many times before on d-3s but the symptom isusually no sled movement.
SONY	WMAF56	Reference 13 cabinet front assembly breakdown	Part number x-3347-139-1 subs to replace component part.
SONY	WMAF50	Intermittent auto reverse	When the tape is playing in the reverse direction, the unitwill intermittently switch to the forward direction.
SONY	WMAF48	Intermittent auto reverse	When the tape is playing in the reverse direction, the unitwill intermittently switch to the forward direction.
SONY	STRD2010	Rta peak meter is low or does not display	Rta peak meter display was very low or would not be displayedat all.
SONY	D15	Slow operation - no play	Sled moved too slowly and unit would not play. checked powerto pwm driver ic ok but noisy. traced noise back to dc-dc converterq-406/d-405. switching waveform on base of q-405 erratic which shouldhave been stable.
SONY	CCDM8U	Capstan motor will not turn	X-201 had dc voltage on each side. x201 was not oscillatingproperly. waveform was a bunch of distorted pulses when ejecting. drumwould also chatter.