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
SONYKP7220
Picture distortionSet had about 8 inch overscan. found set-up cord was18 inches too long.
SONYKP7220
Insufficient vert height, replaced c5521Insufficient vertical height on all three crts: about 3inches short top and bottom of the screen. found vertical sawtooth atbase of q5510 (on da board) reading 2.4vpp, should have read 3vpp.
SONYKV2647R
Retrace lines and raster pulsade, hairline crack on c boardRaster was pulsating at a steady rate about 3 times persecond, retrace lines were visible, excessive brightness and video fading.found a hairline crack on c board g2 line.
SONYKV2647R
Vertical foldover, c508Set has severe vertical foldover on top of screen.
SONYKV2645RS
No operation, replaced q203, d202 and r533No raster, no sound and channel indicator does not light up.
SONYKV2645R
No picture, replaced q006-8 and d012No reception on all channels. found no vc, no 12v at thetuner. all displays and addressing ok. found q006-8 transistors shortedand d012 defective.
SONYKV2645R
Dead, replaced c019Set would not turn on. found c019 shorted.
SONYKV2145R
No sound, broken lead on output transformerNo sound. inspection revealed broken wire from secondaryof sound output transformer to solder lug, right at the lug.
SONYKV2145R
No vhf, bt981 prescalerNo vhf low and high band, very intermittent.
SONYKV1945R
Incorrect tuning function, replaced ic004Only numbers 1 or 2 can be addressed on tv by hand unit.operation on channel selection manually is ok. i found pin 28 of ic004has 10vdc on it at all times. waveforms on pin 37 were normal but theamplitude of waveforms at pin 14 were very low with all n
SONYKV1914
No pictureUnit would blank out approx. after 1/2 hour, sound stillnormal. by turning set off for a while and turning it back on, the unitwould again work for a shorter period of time and blank out. found thatby freezing vertical output ic unit would function nor
SONYKV1546R
Set would not turn off, replaced rl001Set would not turn off when power switch pressed. brightnesslevel would drop but would not turn completely off - intermittent problem.
SONYKV1545RS
Short range remote operation, replaced d1Customer complained of short range, approx. 12 feet.
SONYKV1543R
No tuning memory, replaced c047Customer pulled ac plug from wall outlet during electricalstorms, had to reprogram tuner (lost its memory). c047 a 100pf capacitoron the write/erase line (pin 6 of ic034, cx761) defective allowing pinto remain high after ac disconnection.
SONYKV1221R
Snow picture, replaced c038Every 2 weeks picture would go to snow and remain in onechannel position. tuning functions totally inoperative and manual channelselection would not work. volume up and down functions ok. clock osc.waveform wrong also voltage at q034 base 0v should be
SONYKV2645R
Audio hiss noise, replaced ic401Left channel of matrixed side had distortion plus somebackground hiss, right side sounded good. disrotion showed up mainlyon music, and background noise only showed up when no voice or musiccame from tv.
SONYKV1945R
Dead, replaced fbt and othersSet had a bad flyback causing multiple problems such asshorted horizontal output transistor and b+ regulator.
SONYKV1913
Picture noiseThis unit exhibited several faint vertical bars on the leftside and middle of raster.
SONYKV1714
Picture noiseRetrace lines in the screen. found r721 and r722 reversedin circuit.
SONYKV1545R
No manual or remote functions, replaced x002No manual or remote functions. no 12 volt on pin 12, ic004.clock frequency was correct but only 0.5vpp. voltage on pins 1 and 42 ofic004 was the same on both pins, 0.6v.