TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1946R	Picture distortion, replaced c524	Set would go into vertical bounce after warm-up.
SONY	KV1945RS	Snow picture, replaced prescaler	Snow on all channels. no output from prescaler.
SONY	KV1945R	Sound and picture distortion, replaced ic005	Volume and picture levels go down. one could adjust volumeand picture levels in up mode, but a few seconds later, the levels wouldgo down to minimum.
SONY	KV1945R	Intermittent on/off, leaky d026	Intermittent on/off. last channel memory is off. when turnmaster switch on, tv comes on intermittently. ic006 pin 11 is low (2.4v)should be 5.1v. d026 zener didoe was leaky.
SONY	KV1913	Vcr pb picture distortion	Viewing tv normally, off channel no problem set looks good,however, when vcr played through set, top of picture would curve to rightlike flag waving. vhs system is what customer has and complained on.however, distributor put betamax through unit and sam
SONY	KV1221R	No on/off function, replaced rl001	Unit would not shut down manually or on remote. whenattempting to turn off set with manual switch or remote, the sound wouldmute, but the raster would remain. tapped on the case of relay rl001.power immediately went off. found rl001 was hanging up due
SONY	KV1216	Picture pulling horizontally, replaced ic201	Picture pulling horizontally on some channels. problemtraced to output of sync separator, q301, where horizontal sync amplitudewas lower than normal. observing composite video at pin 14 of ic201showed horizontal sync pulse to be just slightly higher th
SONY	KP7220	Picture distortion	Set had about 8 inch overscan. found set-up cord was18 inches too long.
SONY	KP7220	Insufficient vert height, replaced c5521	Insufficient 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.
SONY	KV2647R	Retrace lines and raster pulsade, hairline crack on c board	Raster 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.
SONY	KV2647R	Vertical foldover, c508	Set has severe vertical foldover on top of screen.
SONY	KV2645RS	No operation, replaced q203, d202 and r533	No raster, no sound and channel indicator does not light up.
SONY	KV2645R	No picture, replaced q006-8 and d012	No reception on all channels. found no vc, no 12v at thetuner. all displays and addressing ok. found q006-8 transistors shortedand d012 defective.
SONY	KV2645R	Dead, replaced c019	Set would not turn on. found c019 shorted.
SONY	KV2145R	No sound, broken lead on output transformer	No sound. inspection revealed broken wire from secondaryof sound output transformer to solder lug, right at the lug.
SONY	KV2145R	No vhf, bt981 prescaler	No vhf low and high band, very intermittent.
SONY	KV1945R	Incorrect tuning function, replaced ic004	Only 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
SONY	KV1914	No picture	Unit 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
SONY	KV1546R	Set would not turn off, replaced rl001	Set would not turn off when power switch pressed. brightnesslevel would drop but would not turn completely off - intermittent problem.
SONY	KV1545RS	Short range remote operation, replaced d1	Customer complained of short range, approx. 12 feet.