TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KX2501	No picture, replaced q401	Picture blanked out, sound ok. found q401 to be leaky.
SONY	KX2501	Dead, replaced d1206, q652, and q1343	Intermittent failure of q652 on ga board caused by shortedfactory added zener diode (d1206/rd15eb3) on the k audio board at the 12vline. it also finally destroyed the 12v regulator q1343 on the bd board.
SONY	KV5300	No tuning operation	The channels would not tune in on this unit. also the channelindicator lamps would occasionally all turn on. we found ic135/lamp driveto be defective.
SONY	KV2649R	No uhf reception, replace ic002	Unable to get uhf channels, vhf low, high ok. traced problemto ic002. logic output on pin 2 was +12v, should be 0v.
SONY	KV2648R	Shut down, replace ic601	This unit shuts down about every four hours. we found the135v line going high. dm7/ic601 was found to be thermally intermittent.
SONY	KV2647R	No manual operations, leaky d-2251	Set could not be turned manually, remote functions ok. ifpower relay was manually closed, the set would operate but the volume andpix would not adjust manually. channels would change ok manually.i observed a large train of pulses on pin 18, ic001. ins
SONY	KV2145R	Shut down, replaced hvr	This unit had a shut down condition which occurred everycouple of hours. we found the hvr ass'y to be defective. it was crackedat the base.
SONY	KV1946R	Intermittent audio, replace l202	Intermittent audio, sometimes would work for a few minutes andsometimes for a week.
SONY	KV1941R	Poor picture and unable contrast operation, replaced dl301	Unable to change contrast, picture looked very weak. founddelay line video output low.
SONY	KV1915	Intermittent dark picture	Picture goes intermittently dark. tap neck and picturereturns.
SONY	KV1547R	Jail bars in the picture	Black jail bars in video. all waveforms appear normal.
SONY	KP7220	No blue, replaced crt and d5320	The stopper diode associated with the blue crt was shortingout about every 30-60 days. we found the problem to be caused by adefective crt. the crt was intermittently shorting. evidently when alarge enough arc occurred the associated transient would d
SONY	TV125	No turn off operation	Power switch s901 operates by breaking ground connection. inexternal dc mode such as mobile camping trailer installation, unit cannotbe turned off since dc return path is continued thru antenna transformers.camping trailer antenna contacts body when in
SONY	KX2501	Incorrect purity, resoldered thp-601	Servicer complained that profeel 25-inch monitor would nothold purity adjustment if it was rotated on bench. other tv's andmonitors in shop had little effect from rotation. distributor duplicatedproblem on another set out-of-box, however auto-degaussin
SONY	KX1901	Weak video	Very weak video.
SONY	KV2648R	Hum sound, adj t204 and t205	Constant 60hz hum heard on audio when hbo or showtime isselected. tone enhance feature on tv boosts hum level even louder. thejerrold jsx3dic cable box does not remove the 60hz am sync pulse off thesound carrier to the tv. if the alignment is not perf
SONY	KV2648R	No sound, replaced r5038, r5039, ic5004, ic5005	Set had no sound, found r5038 and r5039 open. also foundic5004 and ic5005 shorted on x board.
SONY	KV2602	Retrace lines in the picture, replaced l503	Retrace lines in picture.
SONY	KV1952R	Green screen, hvr	Green screen.
SONY	KV1952R	No display, replace zener d2003 and q2007	Original complaint was display out. found channel displayonly partially lit during channel change, and sound up would cause pix upto change at the same time. also, channel up or down would cause sound tomute. traced sound problem to ic2001, pin 10 - p