TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV8100	Dead	No picture or sound when power was turned on. this symptomoccurred when unit was cold or after setting for several hours.
SONY	KV2649R	Dead, replaced ic001	Set would turn on but no function could be activated. if youpush for example ch. up it would immediately change 2 or 3 channels thenwould come back to the ch. it was on just before last turn off.
SONY	KV2649R	Dead, replaced ic001	Set would turn on but no function could be activated. if youpush for example ch. up it would immediately change 2 or 3 channels thenwould come back to the ch. it was on just before last turn off.
SONY	KV2648RS	Missing r602	Servicer found r602 missing from board. looked like it wasnever soldered, as the holes were clean.
SONY	KV2643R	Intermittent shut down, replaced h stat control unit	Occasional slight arcing could be heard and set would inter-mittently go into high voltage shut down condition. inspection of h-statcontrol unit showed cracks in the plastic housing around the bottom cornerwhere one of the ground leads exists the unit.
SONY	KV2145R	Retrace lines on the screen, replace ic502	Set had 6 or 7 retrace lines at top of the screen. i foundthat by cooling ic502 the lines disappeared.
SONY	KV2145R	Intermittent channel change by itself, q007	Intermittently self initiates rapid channel changing.
SONY	KV1948R	Beat interference, normal	Beat interference visible on the screen during low vhf bandoperation. the beat pattern is composed of individual dots such as onewould see from digital interference. it only shows up on a weak rabbitear signal. it is the second harmonic of the power s
SONY	KV1913	Intermittent horiz. whistle	This unit had a very intermittent horiz. whistle. we foundt502 to be vibrating.
SONY	KV1710	Intermittent loss of picture	Highly intermittent loss of picture and sound leaving onlygray raster. loss would be from seconds to hours with no patterndetectable.
SONY	KV1515	No channel tuning	Unable to tune channels 2 and 4, found vc drive transistorq101 leaky, unable to bring voltage lower than 9vdc.
SONY	KV1207	Jail bars on the screen	Very dark jail bar pattern on screen. bars were so dark that they blank picture where they were. found horizontal pulses onthe +12v line at pin 10 of ic301, and discovered leaky c323.
SONY	KPR4600	No sound, replaced ic-3010	No sound, found switch voltage (4vdc) reading 1.5vdc onic3010.
SONY	KP4600	Mis-convergence	Extreme mis-convergence on left and right sides of the screen(for about ten inches).
SONY	KX2501	Picture fades out when external audio plugged in, d1206	Picture fades out when external audio plugged in. r675 openon ga board, r02 burnt on u1 board, q1343 and r1409 open on bd board.replaced these parts. video would fade out when audio plugged to eitherext. input or multi-connector, measured 8.5 to 9.1 vd
SONY	KX2501	Dead, replaced diode on "k" board	Evp-1 ckt operational, shutting down pps. replaced open r675.unit produced raster. hooked up a vtx-1000r. unit smoked and went dead.r675 open again, q1343 open, r02 on u-1 board burned. replaced all parts.unit again functional. however it was found
SONY	KX2501	Shut down, replaced q652 on "ga" board	Either horiz. scan comes up and goes immediately to horiz.shutdown or does not come on at all. voltage on q108 relay drive base lowand relay will not activate when transistor completely shorted prior togoing bad would come up and shutdown within 3 secon
SONY	KV2649R	Poor picture, adj vhf agc	Poor picture on cable busy background.
SONY	KV2648R	No picture, replaced q502	No picture, high pitch squeal.
SONY	KV2648R	No picture, replaced fbt and q502	No high voltage. flyback shorted causing horiz. output tofail.