TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1222RS	Turn off by itself when warm, replaced c005	Set would turn off by itself. could not turn on nor enterremote functions when warm. could flex board and unit would act up.found problem to be c005 was missing from board.
SONY	KP5040	Intermittent no vertical deflection, replaced q951	Intermittently the green picture would fold over at the topand sometimes loose all vertical deflection. when this happened, theset would blank all three crts. cooling the vertical drive transistorq5529 would restore proper operation. this was very mis
SONY	FD30A	No video and retrace lines on the raster, replaced r409	Picture has retrace lines, raster ok, no video.
SONY	KV2670R	Dead set, open relay	Set could not be turned on at time of delivery. servicer hasnot received service manual as yet and requested my help. inspectionrevealed that the relay would not close. relay winding was open.
SONY	KV2670R	No picture, h out q-504	Several units have had the horiz. output transistor q504fail shortly after initial turn on. the devices seem to fail of theirown accord. we can find no other problem. suggest replacement with asturdier device.
SONY	KV2643R	Shutdown after two minutes, removed jw-54	Unit would play for about 2 min. and then shut down. puttingunit on variac at 90vac, unit would play.
SONY	KV2101	Intermittent high-pitch noise, h lin coil l-803	Intermittent high-pitch noise.
SONY	KV1917	Intermittent shut down	Intermittent shutdown.
SONY	FD30A	No audio, open ground between g and k board	Not audio.
SONY	KX2501A	Dead set, replaced d1514	The power supply was whistling and there was no picture orsound. we found d1514 in the high voltage regulator to be shorted. thispresented about 30Ω to the 140v line. the fuse never opened.
SONY	KV2648R	Heavy arcing, resoldered broken etch	When set was turned on, heavy arcing would occur around theflyback. servicer had replaced the flyback, which did not help. foundground etch near t503 was open. this caused the flyback return to beopen. we discovered this by connecting the osc. ground
SONY	KV2647RX	Dark picture of cable channels	Dark picture on only the cable channels that were scrambled.the scrambler was made by octagon regency. the cable system was daviscommunity cable co. in davis, calif. the problem with the cable scrambledchannels was with the horizontal sync.
SONY	KV2647RX	Unlock signal on cable channel, replace c208 and adj t203	Customer on cable unable to lock in on hbo channel 18.
SONY	KV2647R	No display timer function, ac wires to mf-7 reversed	Display time would be on but the time would not change whenthe set was off. when set is turned on, the clock would work until theset was shut off.
SONY	KV1924	Weak crt	This unit looked like it had a weak crt.
SONY	KV1714	No hv sync, lack of brightness	1) no sync vertical 2) vertical roll 3) horizontal out offrequency 4) picture is too dark.
SONY	KV1545R	Poor remote sensitivity, replaced l1	Unit had poor remote sensitivity (4 inches). found coil l1shorted. resistance should be 22Ω, it was 2Ω.
SONY	KV2647RX	No picture on cable, add resistor with r054	Set will not work on cable (hrc system). one fix was to puta 100Ω resistor across r054. this seemed to work in the past. on thenew sets kv-2647rx this fix does not work in all cases. the 100Ω willcause the set to hunt shift back and forth. wha
SONY	KV2647RX	Jail bars, add ground wire	Jail bars in picture. this is the 2nd 2647rx customer hashad. customer claimed jail bars on this unit took 2 weeks to develop.tried tuner, prescaler, d250 all zero effect.
SONY	KV2647RX	Picture distortion, replace r557	When set was first turned on, picture lacked about 4 inchesof vert sweep at bottom and slight compression at top. after about 20seconds, picture and sould would go out. inspection revealed the 15vline to the 12v regulator was only 9vdc. the other 15v