TV Repair: Common Faults and Solutions.

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Repair Guide: Common Issues and Fixes

Brand	Model	Fault	Detailed Problem
SONY	KV2647R	Intermittent no channel reception, replace r-025	This unit would not tune stations intermittently. found r025/22kΩ resistor increased in value to 35kΩ on mf board.
SONY	KV2647R	No channel 11 reception, replace ic002	This unit would not tune channel 11 in all the way. thescreen displayed a herring bone pattern. at first it appeared to be anaft problem. however further investigation revealed ic002 memory to bedefective.
SONY	KV2645R	Popping sound on channel change, replaced t207	Servicer had replaced t207, hoping to cure a highly inter-mittent sound loss problem. set was returned to shop and i noticed apopping sound on channel change.
SONY	KV2601	Intermittent all channel display	Intermittently unit would go to all channel display lightslit. could not tune in any station when all lights locked in. foundnegative line off flyback ok but after going through coil l511 found thatthe negative voltage sometimes missing. also serial n
SONY	KV2602	Intermittent shut down, replaced ic501, d501, q501, t502	Intermittently goes into hv shut down. changed ic501, d501,q501, t502. also reduced the value of r572 to satisfy the adj. procedure. -hq comments: probably this type of shut down is caused by defective hvrblock. the 15.2 +/- 0.1v specified in adjustm
SONY	KV1946R	Picture distortion (v), replace ic502	Would not scan top 2 inches of picture v-size and lin. hadno effect, remove blanking and fills up picture.
SONY	KV1923	Picture distortion (v)	Unit came in with 2 of vertical. we found c520 shorted andthis restored height but the linearity was poor. found c529 to havechanged in value - evidently damaged. c520 must have tantalum replacementfor best results.
SONY	KV1922	Picture distortion (pin)	Severe pincushioning and poor width. q513 pin amp shorted andc810, ic546 to be dried up. after replacing these parts the pin and sizewere substantially improved. however during the first 5 minutes of opera-tion the left and right sides were pulled in
SONY	KV1910D	Picture distortion (h)	Unit had severe horiz. foldover and would short the sg613 atfull voltage. the problem is very elusive to find. have seen severallately.
SONY	KV1723D	Dead	Servicer had replaced horiz. output sg613 and regulator2sc867a. replaced again, also r556 in start ckt. monitored voltage dropacross r807 - too much. replaced c813 and c809. set came on, however,now no g-y from chroma demodulator. checked waveforms
SONY	KV1722	Picture blanking	This unit was in full blanking. the b+ regulator was workingfine. we found the 11v zener off the base of q606 (evp-1) to bedefective. the zener threshold was approx. 5v.
SONY	KV1515	Static related damage	This unit has now been repaired 3 times with static relateddamage to the tuner as the problem. a visit to the customer's homerevealed nothing out of the ordinary. we then carefully gift wrappedthe tuner cluster with 3m electric tape #1245 and grounded
SONY	KV1515	Defective vc drive	We have found many units with defective vc drive transistors.the transistor generally fails within the first 30 days of operation.this is not a 2sc9450r 2sc1364 transistor. in fact i have not seen thisvariety in a sony product.
SONY	KV1510	Picture distortion	This unit had bright bars at the left and right hand side -about 1 wide. the balance of the picture was close to normal althoughlacking detail. we found c532 to have opened up. this filters the b+ tothe video outputs.
SONY	KP5040	Mechanical mis-operation, lubricated piston arms	Mirror would jam in either the inward or outward movement of the mirror. there was a hue shift in the center of the screen.
SONY	KP5040	Channel drift off station, replaced leaky c209	After about 10 minutes, channel would drift off station.found c209 had resistance.
SONY	KX2501	Blanking display, replaced r472, sm error r472 labeled r453	Unit displayed blanking problem. 2 wide bar on the left sideof the crt. i could find no problem except base of q401 was -1v (printcalls +0.3). i found r472 missing.
SONY	KX2501	No picture control, replaced ic1302	1) rgb lines in the picture, red shaded area on the left sideof the screen which would change to green with the hue control. 2) nocontrol of picture, volume control would cause picture to vary and at aset point on the volume setting the picture control
SONY	KX2501	Shut down, replaced flyback	Unit would shut down every one or two minutes after 2 hourswarm up. i could not find anything wrong, but read fdrs and noticedflyback could be cause.
SONY	KX2501	Shutdown, replaced h stat block	H. v. shut down activates intermittently.