TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2602	Vertical foldover, replaced ic502	Vertical foldover at bottom. all voltages around ic501 andic502 checked good except pin 5 of ic502 which was very low, waveformswere distorted.
SONY	KV2145R	No video/sound, replaced prescaler	No video - no sound.
SONY	KV2145R	Dark picture, replaced brt control	Unit loses brightness (goes black) intermittently. voltageok, tp49 goes low whenever problem occurred. found brightness controlshorting to its case.
SONY	KV1946R	Dead, fbt	Flyback arc over.
SONY	KV1946R	Sound noise, replace t206	This unit had a background hiss in the sound. adjusting t206 did no good. found t206 had the incorrect transformer installed.p/n 1-403-360-13 was marked on the outside.
SONY	KV1913	Shut down	At turn on, set would shut down after a few minutes to a fewhours.
SONY	KV1913	No sound	Sound goes on and off, cooling c226 would confirm problem.
SONY	KV1746R	Shut down, installed c547 as per t/n	This unit would intermittently go into hv shutdown.
SONY	KV2644R	Incorrect tuning, replaced ic2002	Set would stay in address position a at all times. i foundwhen i turned channel set switch on and programmed set, it would work ok.but if i shut the set off, and turned it back on again, it would come onin position a and could not be addressed again.
SONY	KV2643R	No operation, replaced c539, c805 and r812	Set inoperative. found r812 open and c805 leaky. replacedthem and picture displayed vertical bar (approx. 5 inches) on left side,r812 was running warm. found c539 open.
SONY	KV1945RS	Poor remote operation, replaced ic1, cx-786 in commander	Poor sensitivity with remote approx. 6 feet.
SONY	KV1945RS	Shut down, selected r563	This unit intermittently shuts off, sometimes twice a week,sometimes once. voltage on pin 12 was 5.3v making it too near thethreshold level of 5.6v, changing r563 to satisfy the procedure in manualresults in a 15k resistor which was half of the original
SONY	KV1945R	No color, replaced ic501	No color. found no pulse at pin 20 of ic301. traced theproblem to pin 22 of ic501 where i found no sync out.
SONY	KV1217	Dead, replaced q602	No sound, no picture, channel indicator stays in one position,tuning and band indicators are dim. found regulator transistor q602leaky, and both audio output transistors q205 and q206 shorted also r232open.
SONY	KV2647R	Snow picture, resolder r053	Set displayed snow on all channels. i found r053 on mf boardimproperly soldered.
SONY	KV2647R	Set would not turn on/off by remote, ic-101	Set would not turn on/off.
SONY	KV2645RS	Color distortion, replaced r751	Bleeding color (red). found r751/470kΩ resistor changedvalue.
SONY	KV2643R	Raster pulsating, replaced r609	Picture and raster pulsating. the 135v line exhibited samepulsation.
SONY	KV2145R	No picture, fbt	Set kept shorting out the horizontal output transistor.
SONY	KV2101	Picture distortion	Set had light vertical bands in picture. they started on the left and became less bright as you moved to the right. horizontal output waveform was affected as well.