Sony TV Repair: Common Faults and Solutions.


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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYKV1945RS
Picture distortion, replaced c544Severe pincushion problem, pin control has no control. baseof q503 was negative instead of 2v. found signal on base has a lot ofspikes, which could come only from one point, the flyback. c544 was opencausing no filtering.
SONYKV1945R
No picture, replaced shorted q006 and q008 on md boardThis set had no vc voltage and band selection voltages werewrong at tuner.
SONYKV1945R
Shut down, trimmed r563This unit intermittently shuts off by itself.
SONYKV1913
Picture distortionThese two units came in with high brightness with retracelines. found r721 open.
SONYKV1543R
Intermittent remote operation, replaced c005Remote commander operative only about 10% of time, mostfunctions completely inoperative. with scope probe at tp 52 m-2 boardabout 5vpp random noise present and remote control signal distortedwhen actuated.
SONYKP5000
Picture distortion, loose screw on hor drive trans. q5104Intermittent horizontal sweep problem causes sweep to collapseand burn a vertical line in the three picture tubes.
SONYKV2648R
Snow picture, replaced prescalerPicture would go to snow after about 5 minutes after turn-on.set was ok when cold. 12 volt line would drop to 7.5v and voltage atprescaler would drop to 1.5v.
SONYKV2648R
High pitch noiseThe unit makes a high pitch sound like a flyback with loosecore. replacing pot transformer did help a little but still audible.wedging the transformer almost reduce noise but awkward solution.
SONYKV2647R
Tuning drift, resolder r053Upon changing channels a good video will come on for a momentbut will drift off to barely viewable negative picture.
SONYKV2647R
No control of brightness, broken foil on crt boardNo control of brightness. picture would start at normallevel and slowly get dimmer with retrace lines, then flash to normalpicture level again. no g2 voltage on pin 12 of crt board.
SONYKV2647R
Picture distortion, replace c549, c550 and c554Slight pie crusting and marginal horizontal sync.
SONYKV2645R
No remote operation, repaired crack on n boardUnable to control operation with remote. found hairlinebreak on n board.
SONYKV2643R
Under scanned picture, r533 value changed, replacedPicture under scanned horizontally and vertically. foundresistor r533 changed value, should read 1.2Ω, read 14Ω.
SONYKV2602
Vertical foldover, replaced ic502Vertical foldover at bottom. all voltages around ic501 andic502 checked good except pin 5 of ic502 which was very low, waveformswere distorted.
SONYKV2145R
No video/sound, replaced prescalerNo video - no sound.
SONYKV2145R
Dark picture, replaced brt controlUnit loses brightness (goes black) intermittently. voltageok, tp49 goes low whenever problem occurred. found brightness controlshorting to its case.
SONYKV1946R
Dead, fbtFlyback arc over.
SONYKV1946R
Sound noise, replace t206This unit had a background hiss in the sound. adjusting t206 did no good. found t206 had the incorrect transformer installed.p/n 1-403-360-13 was marked on the outside.
SONYKV1913
Shut downAt turn on, set would shut down after a few minutes to a fewhours.
SONYKV1913
No soundSound goes on and off, cooling c226 would confirm problem.