TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2647R	Picture draw up and v jitter, c508 reversed	Picture would draw up from the bottom and vertical jitter.
SONY	KV2647R	Set on/off repeatedly, open r-143	When ac cord is plugged in, the unit turns itself on and offrepeatedly. if the plug to socket labelled mf-5 was disconnected, theset stayed on and would not turn off at all. with this connector removed,there was no dc voltage at pin 21 of ic101 and yet
SONY	KV2145R	Shut down, leaky q881	Set would shut off once or twice a week. problem wasisolated to hi-voltage shut down crt. found q881 leaky. with a newtransistor shut down voltage increased by 112v, changed dividerresistor for correct voltage.
SONY	KV1948R	Color distortion, color killer adj	While watching old b/w movies, the customer is unhappy withcolor confetti which flashes through picture. -hq comments: we were able to eliminate color confetti problem in ourlab set (kv1547r) by adjusting color killer level using the followingvoltage di
SONY	KV1946R	Incorrect tuning operation, open l508	Tuning ok, but would not hold channels in memory.
SONY	KV1923	Sound distortion, replaced ic cx760	Sound becomes garbled as volume is increased.
SONY	KV1914	Color distortion	New picture tube would go soft on one of the colors - firstwas the red, second time the blue. found filament voltage from theflyback incorrect. peak to peak was 30v s/b 22, also ringing.
SONY	KV1913	Incorrect color	Incorrect color phasing. fsc had replaced crt (becausepicture was dark) with new crt installed the screen controls did notaffect the proper color stripe on the trinitron-red controlled green-green controlled blue and blue controlled red. with nysc colo
SONY	KV1747R	Incorrect tuning function	No vhf channels, only snow. uhf channels ok.
SONY	KV1715R	No picture	Intermittently this unit would lose video and the raster wouldget very bright, with retrace lines.
SONY	KV1541R	Vertical roll and foldover, replaced c574 and q551	Vertical roll and fold over problem.
SONY	KV1513	Shut down	Horizontal shut-down after unit is turned on.
SONY	KV1217	Shut down, cleaned and adjusted hor. freq. control	Set going into hv shut down intermittently when turned on.set would also horizontal freq. adjustment was on very edge of locking.
SONY	KP7225	Dead, yoke connector loose caused other parts to fail	Initial problem - dead. replaced ic301 and q202 on a boardplus f602, 1.6a fuse on board. this restored sound and hi voltage.crt's were blanked out. further examination disclosed q601, regulatordriver, q609, regulator, r609 150Ω at 1/8w open which d
SONY	VTX1000R	Ch 14 would not lock	Cable ch. 14 could not lock in on a cable co. using hrc cablesystem. aft is not pulling far enough down to lock on ch. 14.
SONY	VTX1000R	Tuning would not lock	At turn on, unit would display random channels, never the lastchannel which was displayed at turn off. inspection of circuit revealedno reset pulse at pin 7 of ic001 on a board. this pulse is supplied fromic002. voltage check on ic002 showed only abou
SONY	TV790	Shut down	Picture takes 5 to 10 minutes to come on and sometimes goesoff after on. found osc. signal at drive transformer weak if probe istouched anywhere before h. drive transistor picture comes on. found e-bjunction of q502 open when transistor cold.
SONY	TV770	Battery pack availability	Have been contacted by two customers regarding replacementbatteries for eveready type 563. they both stated they contactedeveready distributors for a replacement and were informed that type 563is no longer available and that there is no substitute. hav
SONY	KV9200	Incorrect brightness operation	Right side of the screen is brighter than left.
SONY	KV9200	Part mismount	On printed circuit board w, capacitor c524, the marks forpositive and negative connection are incorrectly placed.