TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KX2501	No video out, replaced q1343	No video out. traced problem to bd board. 12vdc regulatorleaky. voltage reading was 10vdc, should be 12vdc. this caused incorrectbias to be applied to rgb drive transistor via bd cutting off the drivetransistors.
SONY	KX1901	Shorted crt	The picture tube shorted causing a chain reaction ofdestruction. the hvr block was found defective. also found were shortedhoriz, output transistor, shorted reguator transistor, and a bad flyback.
SONY	KV9200	130v would not regulate	130v would not regulate. all components in power supplychecked good.
SONY	KV3000R	Mechanical incorrect operation	The doors would operate only intermittently on this unit.i found that motors for the left and right sides had come loose.
SONY	KV2654R	Color on b/w picture, adj cv-301	Color confetti on b/w telecast.
SONY	KV2649R	Lose color, replace x001	When unit was turned off/on color would lock in. turn off/onagain and you would lose color and the channels would not change.
SONY	KV2648R	Intermittent picture shrink, replaced ic601	Picture shrinks intermittently. stations shift when pictureshrinks.
SONY	KV2648R	Dead set, replace r570 and h out	After about 15 min. horizontal output transistor (2sd957a)would short out. during the first 15 min. transistor would increase intemperature. found r570 was reading less than 0.2Ω - should be 0.22Ω - was able to put in a 0.23Ω and everything rem
SONY	KV2647RX	Jail bars on the screen, changed d250	This unit had faint jail bars on left side of picture.
SONY	KV2647R	Audio buzz on scrambled stations, adj t204/205 sif	Audio buzz on scrambled stations only. the following stationsexhibited the problem: hbo (ch. 30), showtime (ch. 34) and cinemax(ch. 38). they use jerrold box (new england cablevision cable co).
SONY	KV2602	Audio buzz on scrambled stations, adj sif t204 and t205	Audio buzz on scrambled stations only (hbo & cinemax).
SONY	KV2145R	Pic folds over at top, r520 decreased in value	Unit had 1/2 inch of fold over top of screen. found r520reading 8.1k (should be 10k), upsetting bias on vertical outputs.
SONY	KV2145R	Relay chattering, resolder d602	Power relay rl001 would not stay engaged when power on buttonwas depressed. the new mf board didn't cure the chattering relay problem.
SONY	KV1953RS	Dark picture, replace c548	Dark picture, sometimes blowing fuse and regulator. fivecases have come to our attention of this problem, which is caused by c548being shorted or leaky. attached are samples for evaluation.
SONY	KV1952RX	Dark picture, replace c530 and r538	Dark picture gave impression of insufficient high voltage.in addition the red convergence was off slightly (like h. stat controlslightly misadjusted).
SONY	KV1948R	Picture distortion, c654 open	Insufficient width and height, low 135v at l651.
SONY	KV1916	Immediate shut down	On turn on, unit would immediately shut down. found r528opened.
SONY	KV1911	Severe pin cushion	Severe pin cushion, pulled in 2-3 inches on each side.checking 15 volt line found a negative h pulse on the line. found c810to be open.
SONY	KV1747R	Sets will not lock on cable channels	Set will not lock on cable channels. usually the 47 modelsand models with a similar chassis. i tried reducing the value of c208but this made the problem worse. we tried increasing the values of thiscap and found that the sets would perform properly wi
SONY	KV1747R	Channel lock	When changing channels, up/down with remote, unit would lockon channel 8 for approx. 8 to 10 seconds. unit would scan up/down allother channels with no problem.