TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2601	No color, replaced shorted cv301	After about 2-3 minutes of playing time color disappeared.found cv301 actually physically shorted to 0Ω.
SONY	KV2601	No uhf, replaced q203	During programming unit would skip uhf band. 12v b+ was low(10.5v), q203 was bad.
SONY	KP5000	Incorrect function for tuning, q2211 leaky	During programming unit would not stop on active channels in one direction from low to high.
SONY	KV2644R	No tuning lock, replaced c219	Would not lock on to any channel in program. aft voltage pin#10, ic201 down to 0.4v.
SONY	KV2643R	Channel drift, replaced ic2003	Set would drift off channel during operation. found ic2003(display memory) apparently loading control ic and changing pwm voltage.
SONY	KV2643R	Retrace lines, broken land on c board	Servicer informed me of a problem where the picture would benormal and then get brighter and go into retrace and then back to normal.then it again would repeat itself.
SONY	KV2643R	Dead, remove jw54 and others	No operation above 100vac. h. voltage was at 23kv. servicerhad replaced flyback and ic501. voltage to shutdown circuit was 5.7v.removed l801, h. voltage went up to 26kv. -hq comments: we will publish updated info on this problem shortly. asfor now c
SONY	KV1714	No video	No 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.
SONY	KV1543R	No station selection, replaced ic032	Stations wouldn't select and sound would turn up but wouldn'tgo down.
SONY	KP5000	Changes channel by its self, replaced infrared sensor	Unit 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).
SONY	KV2643R	Retrace lines, replaced cx556	Set would gradually change from normal to retrace lines.video signal on output of cx556 changing level.
SONY	KV2601	No sound, replaced ic033	This 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
SONY	KV2601	Picture drift, replaced c516	Dealer 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.
SONY	KV1712	Dark picture	Raster 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.
SONY	KV1543R	Neon does not function, see below	No function of neon bulb (nl15) on remote or manual commands.all other functions work. found only 75vac at junction of r018 and r017to ground.
SONY	KP5000	Will not stop channel search, replaced c159	In 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
SONY	KV2643R	Weak picture, replaced leaky c208	Set had weak video with sync problem.
SONY	KV2643R	No tuning, replaced ic033, cx804	After pressing channel button j none of remaining channelscan be manually selected until remote selection is used, at least once.
SONY	KV2643R	Picture blanking, repaired cracked foil	This 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
SONY	KV1543R	Channel search doesn't stop,replaced parts below	All 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.