TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2647R	White h lines on the picture, replace q001	The picture had white horiz lines producing a venetian blindeffect. there was also a buzz of 7-8khz in the sound. we found that thevc line was not being properly filtered. found q001 (fet) in the activefilter to be defective.
SONY	KV2647R	Dark picture, shorted c725	This unit had a dark picture and the picture control did verylittle. found c725 shorted.
SONY	KV2142R	No picture, replace c2213	33v line shows video on dc of about 1 1/2v. after warm-uptuner drifts off channel with or without afc.
SONY	KV1953R	No tuning operations, replace ic003	Channel up or down inoperative. also unable to erase anychannels. no logic change at pins 1-4 on ic003.
SONY	KV1952RS	No function, replace x2001	Unable to control volume picture or channel change. led wouldnot light. found osc crystal low in amplitude at ic2001. freezingcrystal would change amplitude from 20mv to 2v.
SONY	KV1946R	Dark picture, r715 open	Picture was dark. measured screen voltage. range was from105-185 vdc. found r715 reading in the megΩ.
SONY	KV1922	Picture distortion	Set had pincushion problem. traced problem to q514. signalat collector was distorted.
SONY	KV1915	Dark picture	Picture was very dark. no brightness and no 900v to crt.
SONY	KV1914	Tuning drift	Stations could be locked in, but then would drift off. pin 10of ic201, aft amp out was floating, and voltage was varying.
SONY	KV1747RX	Dark picture	Color information was present but there was no luminance atoutput of ic341. input signal was ok.
SONY	KV1713	Picture distortion	Short width - from 1/2 to 1 inch. problem starts as pinproblem. servicer then finds picture just a little short of width. mayhave been like that for some time.
SONY	KP5040	Mechanical misoperation, greased small gear shaft bearings	The door would open only halfway and the motor would shutoff. the door would not close more than 2 inches before shutting off.there was no grease on the small gear shaft bearing.
SONY	KP5020	Overscan green crt	Green tube was overscanned. traced problem to q5337.transistor was leaky from collector to emitter.
SONY	FD20A	Dead, repaired cracks on board	Set came in dead. no power, whether using batteries or acadaptor.
SONY	KX2501	White vertical bar on the picture, see circuit change below	White vertical bar about three inches in from the left side of the screen. it would go away when the pc boards were opened out to the service position.
SONY	KV2649R	Intermittent power on/off, replaced d021	Intermittent power on/off. customer controls erratic.found d021 leaky on mt board.
SONY	KV2649R	Volume low, replaced t205	At maximum volume setting, the volume was about 1/3 of normal. inspection of sound output signal at pin 14, ic201, revealed avery low level signal.
SONY	KV2647R	No signal reception on chs 11 and 13, replace ic-002	Could not tune in chs 11 and 13. all other channels ok.
SONY	KV2647R	Shut down, power module	Power module causing high b+, shutting the set down. uponreplacing power module, noticed non-linearity in the bottom half of thepicture. top half of the picture was fine.
SONY	KV2643R	Shut down, replaced d502 on a board	Unit would shut down when the voltage of d502 dropped below4.8v. in the schematic pin 9 of ic501 shows 5v. proper voltage shouldread 5.8v. in turn d502 would read 5.6v. when the voltage at d502dropped to 4.8v, waveform was distorted and unit would sh