TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1217	Picture distortion, see modification below	Horiz. centering adjustment will not shift picture far enoughtowards the right. center adjustment only expands the picture. -hq comments: try the following circuit modification. place the horiz.centering r. position. the r1, r2, c1 values shown shoul
SONY	KV1207	No channel look	Set changes channel by itself usually ending on ch. 13position.
SONY	KP5040	Incorrect mechanical function, use of loctite	When unit was turned on the mirror door would extend about2/3 of the way out and start clicking. the motor would continue to runand not shut off. disassembly revealed the retaining nut on the driveshaft had worked loose allowing the left hand side door
SONY	KV2647R	No picture, open r057 and prescaler,	R057 resistor open (mf board). no problem found in reg.circuit. solder splash on feed thru terminal of prescaler.
SONY	KV2645RS	Tuning would not lock, replaced s2262	Tv would continuously scan through all channels. foundchannel up button closed.
SONY	KV2645R	Dark picture, replaced r-751	Dark picture like weak crt. found r751 changed value.
SONY	KV2601	Part number missing	Servicer has kv-2601 with spark gap on c board shorted -schematic designation sg. the part number was omitted from the servicemanual of all the above listed models. -hq comments: the spark gap in question is not available as a separatepart. it comes w
SONY	KV1945RS	Picture distortion, replaced c544	Severe pincushion problem, pin control has no control. baseof q503 was negative instead of 2v. found signal on base has a lot ofspikes, which could come only from one point, the flyback. c544 was opencausing no filtering.
SONY	KV1945R	No picture, replaced shorted q006 and q008 on md board	This set had no vc voltage and band selection voltages werewrong at tuner.
SONY	KV1945R	Shut down, trimmed r563	This unit intermittently shuts off by itself.
SONY	KV1913	Picture distortion	These two units came in with high brightness with retracelines. found r721 open.
SONY	KV1543R	Intermittent remote operation, replaced c005	Remote commander operative only about 10% of time, mostfunctions completely inoperative. with scope probe at tp 52 m-2 boardabout 5vpp random noise present and remote control signal distortedwhen actuated.
SONY	KP5000	Picture distortion, loose screw on hor drive trans. q5104	Intermittent horizontal sweep problem causes sweep to collapseand burn a vertical line in the three picture tubes.
SONY	KV2648R	Snow picture, replaced prescaler	Picture would go to snow after about 5 minutes after turn-on.set was ok when cold. 12 volt line would drop to 7.5v and voltage atprescaler would drop to 1.5v.
SONY	KV2648R	High pitch noise	The unit makes a high pitch sound like a flyback with loosecore. replacing pot transformer did help a little but still audible.wedging the transformer almost reduce noise but awkward solution.
SONY	KV2647R	Tuning drift, resolder r053	Upon changing channels a good video will come on for a momentbut will drift off to barely viewable negative picture.
SONY	KV2647R	No control of brightness, broken foil on crt board	No control of brightness. picture would start at normallevel and slowly get dimmer with retrace lines, then flash to normalpicture level again. no g2 voltage on pin 12 of crt board.
SONY	KV2647R	Picture distortion, replace c549, c550 and c554	Slight pie crusting and marginal horizontal sync.
SONY	KV2645R	No remote operation, repaired crack on n board	Unable to control operation with remote. found hairlinebreak on n board.
SONY	KV2643R	Under scanned picture, r533 value changed, replaced	Picture under scanned horizontally and vertically. foundresistor r533 changed value, should read 1.2Ω, read 14Ω.