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
SONYKV2682R
No functions, resolder connector wiresSet could be turned on. color, hue, sound, etc. would notwork. traced signal md1 from ic101 up to ma, mb board, but nosignal return key 1 or key 2 back to ic. removed front panel and setstarted to work. we either had a pinched wire or cold joint.
SONYSLHF300
Audio interference in pictureNo beta hifi recording carrier wave 2 or 4 on pins 11 and 9of ic3 respectively.
SONYCFSW400
No part numberMissing p/n of cabinet ass'y in s/m. x-3327-907-1 silver x-3327-908-1 black -hq comments: we will issue a s/b.
SONYSTRVX550
Premature speaker protectionWhen four speakers were hooked up, the unit would prematurelydisengage the speaker relay - about 20db setting. we found c721 to beopen and causing the problem.
SONYSLHF300
No horiz sync in cue/revThe unit intermittently would loose horiz. sync in the cue/revmodes. we found q504 to be thermally intermittent which allowed phaseoutput to be mixed in with the c/r adjustment.
SONYSL25
Incorrect capstan free speed (picture distorted)The capstan was running at the incorrect speed in bi, ii, iii.the problem was caused by ic401/pins 52, 53, 54 putting out the incorrectlogic. this is the first time i have seen this happen with this ic.
SONYKV4000
Intermittent band switchThe unit would intermittently not go into vhf high. we foundic102/band switch to be the cause.
SONYKV1957R
Picture overload/interference, install a capacitorThe set would intermittently have an interference in thepicture and sound which would sometimes overload it. the problem wascaused by horiz. noise that was appearing on the u input to the band-switch ic/ic102 pin 3. the noise was not originating from a
SONYD5
No sled movementNo sled movement in either normal or service mode. flywheeltransistors had been overheated and damaged. replaced 5 flywheel tran-sistors. sled would then move only in one direction.
SONYKV20XBR
P/n for m bracket and shield case power supply blockI need the part numbers for 1) the plastic frame that the mand d boards are mounted to, and 2) the metal cage that the ga and gbboards slid into. -hq comments: the part numbers you asked for are as follows: 1) m. bracket: 4-374-217-1
SONYBMC550
No videoNo video record, audio ok.
SONYBMC110
Lines in pixLines in pix.
SONYSL10
Eats tapeEats tape.
SONYSL10
Eats tape, intermittent loss of fgEats tapes. capstan speed overruns, spilling tape.
SONYSL20
Unable to tune vhf hi band switches to uhfUnable to tune vhf hi band switches to uhf tuning with vhf hiindicated. ic401 pin 17 would not go low when vhf hi selected.
SONYSL2400
Intermittent operationApparently glitches were going to the microprocessor andgiving it commands.
SONYD5
Unit shuts downIc508 (pwm drive sled) burns up. also, pin 23 ic501 voltagegoes up to 4vdc when ff is pushed in service mode. it should be only+1.5v.
SONYCDP70
Motor starts in correct direction, then reverses & overrunsMotor starts in correct direction, then reverses and over-runs.
SONYCDP70
Motor reverses and spins backwardsMotor starts in forward direction, then reverses and spinsbackwards until shutdown.
SONYTCW2
Bent motor mounting brackets (no transport)Tape decks did not work because the motor brackets had beenbent downwards by the weight of the motors. the motors are heavy and thebrackets are made of soft metal, so they can be deformed in normal ship-ping and handling.