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
SONYKV1714
No videoNo video. just snow only. but if you adjust the tuningselector you can get ch. 7 and ch. 5 but if you go back to ch. 5 thesignal in ch. 7 will be erased. no -24v power supply.
SONYKV1543R
No station selection, replaced ic032Stations wouldn't select and sound would turn up but wouldn'tgo down.
SONYKP5000
Changes channel by its self, replaced infrared sensorUnit would change channels without manual or remote activa-tion. customer indicated that remote functions would not coincide withremote hand unit when warm (this problem was intermittent).
SONYKV2643R
Retrace lines, replaced cx556Set would gradually change from normal to retrace lines.video signal on output of cx556 changing level.
SONYKV2601
No sound, replaced ic033This customer has a lot of static from carpets in the home.a spark jumps from her finger each time she touched the channel selectionbuttons. this time it took out ic033. the last time ic2001 failedcausing no sound. on the ic033 pin 10, ch. bias voltag
SONYKV2601
Picture drift, replaced c516Dealer expressed concern over the fact that although thevertical was normal and the vertical hold was ok, the position where thepicture locked in was not in the mechanical center of the control infact it was to one end of the control.
SONYKV1712
Dark pictureRaster very dark. chroma information present but no y signalat output of y amplifier. i found dc level at pin 14 of ic401 was veryhigh and no video here as viewed on scope. disconnecting pin 14 from pcboard restored the video signal at pin 14, ic401.
SONYKV1543R
Neon does not function, see belowNo function of neon bulb (nl15) on remote or manual commands.all other functions work. found only 75vac at junction of r018 and r017to ground.
SONYKP5000
Will not stop channel search, replaced c159In the program mode, set would not stop searching when astation was tuned in. m-15 on the m board had the required horizontalpulse. m-9 on the m board had the sync pulse. the positive and negativeaft voltages on pins 1 and 2 of m-8 appear to be normal
SONYKV2643R
Weak picture, replaced leaky c208Set had weak video with sync problem.
SONYKV2643R
No tuning, replaced ic033, cx804After pressing channel button j none of remaining channelscan be manually selected until remote selection is used, at least once.
SONYKV2643R
Picture blanking, repaired cracked foilThis unit would rhythmically go from good picture to excessbrightness with retrace lines then to black screen. this would happen atabout a 7 second interval. this would happen continually as long as setwas turned on. the collector voltage on q704, 705
SONYKV1543R
Channel search doesn't stop,replaced parts belowAll indications were that set would tune properly but wouldovershoot each channel. result was unstable sync and in general poorpicture quality. pin 10, ic201 (cx555) aft was reading approx. 9v vs2.5v. at pin 2, ic033 (cx804) was reading approx. 10v.
SONYKV1543R
No remote function, replaced ic001Remote does not work, manual ok.
SONYKV9300
No control of brightnessNo control of brightness, excessive brightness even withscreens and drives down, voltages ok in abl drive circuits. also incolor.
SONYKV8000
Incorrect brightness operation with retrace linesExcessive brightness and retrace tube cathode voltages low,10v.
SONYKV2643R
No sound or picture, replaced ic2002No sound or picture. could not program any channels norwould the set change address positions.
SONYKV2643R
Incorrect channel indicationThe channel indicator neon lamps are polarized and will notlight when soldered in backwards. the lamps are not marked as to whichway they are to be soldered in.
SONYKV2101
Poor v linearity, r517 increased in valuePoor vertical linearity top 1/3 of picture slightlycompressed. vertical size control to end of range. waveform at base ofq501, blanking pulse 5 msec, it should be 1.2 msec.
SONYKV1714
DeadDead set, 1.6 amp fuse blown, horizontal out transistorshorted, b+ regulator shorted.