Sony TV Repair: Common Faults and Solutions.


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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYKV1543R
Channel indicators not lit, leakage between ic032/pin 1 & 20Unit would not come on with all channel indicators lit.unable to select channels. once in a while unit would function properly.
SONYKV2644R
No operation, replaced l001Although remote and manual controls did not work, unit wouldcome on with master on/off switch (intermittently).
SONYKV1945R
Dim picture, replaced r555 and d513Dim picture. found no 950v on c board, r555 open and carbonpath between pins 1 and 2 in crt socket.
SONYKV1945R
Shut down, replaced relay rl001Set plays several hours, then shuts off. remote control ormanual on-off buttons would not turn the set back on for several seconds.relay would click every time the set on/off button was pushed.
SONYKV1913
Picture distortionVertical flutter at top one-half inch of picture, increasingvertical size control would eliminate this and fill out picture, butretrace lines would appear. vertical output waveform at pin 3 of ic502was of sufficient amplitude, but had horizontal signal
SONYKV1913
Channels no lockNo reception for 30 minutes when set is started from a coldstart. then channel change was very slow. channel did not changeinstantly but slowly over a period of 5 to 10 seconds.
SONYKV1751
Picture distortionPiecrusting in picture.
SONYKV1714
No pictureNo picture, distorted sound. found vhf to be very snowy.
SONYKV1545R
Remote only within 10 inches, replaced q2 "n" boardRemote had to be within 10 inches of tv unit to activatevarious modes. found q-2 amp on n board with base emitter leakage.
SONYKV1545R
Intermittent retrace lines in picture, replaced r722After the unit was energized, fine retrace lines wouldappear after 5 seconds and there was no control of brightness. g2voltage would not go low enough and g1 voltage was 125v dc instead of 30vdc. wrong value resistor had been inserted in board (r722) i
SONYKV1217
Incorrect tuning operation, replaced r078In program mode, pressing tune-up button would cause a changein address position only and could not program any channels. also, nochannels could be put into or removed from memory.
SONYKP5020
DeadDc block assy failure (distorted waveform) dc fuses open.
SONYKP5000
Dead, replaced mica spacer under vert output transistor2.5 amp fuse on b+ line would blow every 7 to 10 days.replacement of the fuse restored operation and hours of testing providedno clue to problem causing fuse to open. by by-passing the relay witha jumper and using a variac, increasing ac input to 130v a
SONYKV2645R
Snow picture, replaced bt981 prescalerUnit goes to snow. substituting tuner didn't cure problem.voltages around front end seems to be at spec. tried prescaler andthat solves the problem.
SONYKV2645R
Poor remote operation, replaced q1Remote would operate intermittently and is usable up to6 feet from cabinet. q1 on head amp board noisy - collector voltage onq017 on md board was varying between 4 and 8 volts.
SONYKV2601
Snow picture, replace c209Snowy picture on all channels. uncontrollable rf, agc:measuring dc potential at pin 5 of ic201 (cx555) netted approx. 2.5vdcwith no change upon varying rf agc potentiometers. measuring c209 outof circuit yielded approx. 20 microamperes leakage.
SONYKV1945R
Incorrect tuning operation, replaced zener d008, q006, q008Unable to tune any vhf/uhf stations.
SONYKV1945R
Poor remote operation, replaced c4The range of the remote control was no more than about 8 feet. there was excessive noise seen at output of n board, remote amplifier.
SONYKV1913
DeadCame dead with shorted horizontal output and fuse. replaceparts, plug to variac and slowly raised line voltage. current wasexcessive showing short on the circuit, but doesn't show on theΩmeter.found bad flyback.
SONYKV1545R
No tuning, replaced pre-scalerNo signal on any channel except sound on ch. 13 only. ifexternal voltage was introduced to vc line i could get some of the highband channels, which indicate tuner was good.