TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV1947R	No tuning most channels, resistor change	Kv-2649r will not tune most channels, only 5 and 6. kv-2647rwill tune some of them, some sets will and some of same model will not.
SONY	KV1945RS	Dead, d603g	Set will not turn on.
SONY	KV1941R	Dead, replaced open r812	This tv was dead when servicer received it. replacing thegcs, q901, f602 and t801 restored both picture and sound. however, therewas severe ringing on the left side of raster. all sweep derived voltageslooked clean on scope. further troubleshooting r
SONY	KV1922	No color	No color, found no 3.58mhz output at cx172. traced problemto capacitor c330 (leaky, reading 300Ω).
SONY	KV1730R	Dead	This unit lost all signal at the 3rd stage of the remotepre-amp. we found the capacitor in the tank circuit off the collector ofq1103 to be shorted.
SONY	KV1546R	Intermittent no color, replaced l304	This unit was losing color intermittently. servicer reportshe has had 2 other units with the same problem.
SONY	KV1511	Darker picture on the left side of the screen	This unit had a darker picture on the left side of the screen.the screen was divided almost down the middle with the right side normal.scoping the 110v line revealed about 35vpp of horiz. noise c528 was foundto be defective.
SONY	KV1222R	Hum noise in the set	End user stated he could hear hum coming from the unit evenwhen the unit was turned off. turned out that customer was hearing anarcing within the capacitor. cap is across the ac line in (c601, 0.22uf).
SONY	KV1222R	The door will not stay shut	The door will not stay shut. -hq comments: the countermeasure to the above problem is given in thedecember 1982 fpr summary.
SONY	KP7225	Unable blue horizontal convergence, replaced q5353	Blue horizontal convergence control inoperative.
SONY	KP5040	Vertical line in the center of the screen	Vertical line in the center of the screen from cross hatchgenerator. lifted resistor's r3393 and r3384 and connected them to ba-9pin 2. this method of getting rd of the vertical line is better thanjumping a capacitor across d3312. with the capacitor a
SONY	KP5000	Convergence change, replaced green crt	When setting unit up for convergence by placing hatch patternon screen, the set would set up nicely. then when switching the crosshatch off, the pix looked severely mis-converged. closer inspectionrevealed that only the green was mis-converged and in v
SONY	TV520	No picture	No video when replacement crt is used. have had 5 reports ofthis problem. p/n 8-731-105-15, ct-450 is being subbed by 1-546-039-00.this replacement has an adapter socket to use. however, when hooked upno video is received. -hq comments: installing th
SONY	TV115	Intermittent agc	This unit displayed very intermittent agc. under very strongsignal conditions it would play well. we found r333 to be thermallysensitive. it looked fine however, no signs of overheating.
SONY	KX2501	Dead, replaced d1206	Dead. evp-1 ckt ok, shutting down pps. replaced open r675,produced raster. hooked up a vtx-1000r unit smoked and went dead. r675open again, q1343 open, r02 burned. replaced all parts.
SONY	KX2501	No power, replaced t652	This unit had no drive to the converter output on ga board.we found the primary of t652 to be open.
SONY	KV9000U	Incorrect parts compatibility	Servicer ordered thyristor from distributor using p/n1-801-010. this number subs over on the microfiche to p/n 8-719-000-10.in the semiconductor replacement handbook, page 321, diagram #d040 showsthe lead configuration of the substitute part. if this c
SONY	KV2648R	A small purity spot on the screen, replaced c801	This unit had a small purity spot on the right-hand side ofthe screen. after much adjustment we nearly concluded that the crt wasdefective. further examination revealed the etc ckt to be the cause.disconnecting the etc coils eliminated the problem. we
SONY	KV2648R	Incorrect color, resoldered ic4005 pin 14	Bad color. hue was bad. could be mistaken for purityproblem. found bad solder connection at pin 14 of ic4005.
SONY	KV2647R	Part of picture blanking out, r557 value changed	Horizontal problem. part of pix blanked out. frequency notstable. found r557/1.2Ω resistor had climbed in value to 12Ω.resistor located on the 15v line.