TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1954R	Need p/n for uhl switches, part of rv001 1-228-943-00	I need the p/n for the u-h-l switches on m-2 board. -hq comments: the switches in question are part of rv001 volume block,preset (p/n 1-228-943-00). the whole block has to be replaced.
SONY	KX2501A	Picture fade in and out, replaced q1320	When set would get warm, the video information would fade inand out very slowly. by keeping q320 turned off, the video would notfade. everytime the video started to fade, the base of q320 would go lowand it would turn on. found q1302 on bd board was l
SONY	KV2680R	No sound, replace ic-1106 on x board	This unit had no sound. when off station, a rushing soundwas present, however, when receiving a station the audio was completelymuted. we found ic1106 to be defective.
SONY	KV2675R	Aft osc, cold solder on aft coil	Channel would oscillate in and out of frequency about 1/2cycle per second (vc voltage was varying at the same rate).
SONY	KV2670R	Dead, replaced crt, h out and r-608	The set went dead and smoke rolled out the back. we foundr608 to be the cause of the smoke. furthermore, q504 was shorted as wasthe crt. the strange part of this failure is that both fuses were intact.
SONY	KV2649RX	Immediate shut down, replaced hvr block	Set would come on and immediately shut off.
SONY	KV2649RX	Dead, replaced h out transistor	Set came in dead. found horizontal output shorted.
SONY	KX2501	Bullets in picture, grounded crt pin 10	The unit had bullets on the screen even with no video input.it appeared to be caused by some kind of corona discharge. furtherinvestigation revealed pin 10 on the crt to have a charge. this pin isnot connected to anything on the crt board. grounding t
SONY	KV1948R	Picture distortion, replace c654	The picture was pulled in on all sides and was snowy. wefound all b+ power supplys to be low. the 135v power supply was about 103v. regula-tion was poor. increasing the line voltage to 140vac resulted in normaloperation. we found c654 which is across t651/pot t
SONY	KV1941R	Video drift, leaky d2213	On low channels video would drift.
SONY	KP5040	Incorrect mechanical operation, adjusted gear ass'yg	New arm assembly was installed. door would not close all theway on right side. found large gear off one tooth on gear strap inassembly.
SONY	KP5040	Incorrect mechanical operation, replaced arm ass'y	Mirror would not extend to complete open position.
SONY	KP5040	Buzz in sound, adj helical filter and replaced aft with r	Buzz on some cable channels. this complaint was pending sincedec. two trips were made to the customer's home. on the first trip iadjusted the helical filter which removed most of the buzz.
SONY	FD30A	Poor vhf reception, ant contact plate a missing	The reception on vhf low channel was very poor.
SONY	KX2501	Mechanical popping noise, tighten cabinet screws	The customer said that the set made loud popping noises evenwhen turned off. the sounds were caused by the cabinet contractingduring temp changes. we found the screws mounting the mask to the maincabinet loose by 2-3 turns each.
SONY	KX2501	Immediate shut down, replaced r1602	Unit would go into shut down within 2 minutes of turn on.found r1602 open. replaced with another 24Ω resistor and performedmanual check for shut down circuit.
SONY	KV2649RX	Dark picture, add cap to c546	When viewing scrambled channels using the jerrold cableconvertor box, the picture is very dark with smeared reds.
SONY	KV2648R	Audio noise in matrix, resistor change	Whistle in matrix audio only. the countermeasure given to meto resolve this problem worked.
SONY	KV2647RX	Picture distortion, poor grounding at rca type connector	Weavy red lines from top to bottom about one inch thick onlow vhf channels. also radiating to other sets on same antenna line.
SONY	KV1515	Buzz in sound	Buzz in sound on showtime scrambled cable channel only. allother channels ok. verified problem, noted that several older sonychassis in same house worked ok (including kv-1710/1941r/8000).