Sony TV Repair: Common Faults and Solutions.


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Search: Sony
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Sony Repair Guide: Common Issues and Fixes

Brand Model Fault Detailed Problem Solution By
SONYKV1223R
Snowy picture, replaced ic005No output was present from pin 20/ic005 (pwm out for vc).we further discerned that the prescaler was also malfunctioning.
SONYKP5040
Picture distortion, shield wire connection changedVertical instability on channel 4 only. also loss of verticalsync, deflection and excessive noise only on channel 4. this symptom hasonly appeared in southern connecticut.
SONYKV3000
Intermittent mechanical incorrect operationDealer informed me the doors on kv-3000 would sometimes notclose, this was very intermittent. changed resistor r606 from 180k to120k. dealer will inform me if the problem happens again (resistor onmg-2 board).
SONYKV2654R
No tuning operation, shorted cp004Would lock up on one channel also unable to tune stationproperly. found one of the 220pf capacitors in cp004 shorted placing 24volts on the line of the vc as well as the channel select line. there areno p/n's in the manual for cp001/002/003/004 on the
SONYKV2648R
Beat pattern in the picture, replace vhf tunerBeat pattern on all channels. disconnected vc and applied dcvoltage. found it only took 0.01 volts to go from a fair picture to onewith beat pattern.
SONYKV2648R
No screen display, open q4049 and shorted d4046Bar pattern would not operate on any function. found 9vdcmissing on output of 9vdc regulator. found transistor, q4049 opened andd4046 shorted.
SONYKV2647RX
Too much red intensity, adj acc rv303Excessive color intensity - too much red.
SONYKV1946R
Overheat, leaky d012 causing r123 openR123 overheats and eventually open.
SONYKV1946R
Shut down, replaced ic032Set would turn off when channel 3 was selected. found signaldistorted out of microprocessor when 3 was pressed.
SONYKV1943R
No lock channel and volume, open c001 on m2 boardSet would change channels on its own. also sound would go upon its own. found c001 on m2 board opened.
SONYKX2501
No picture, replaced q401Picture blanked out, sound ok. found q401 to be leaky.
SONYKX2501
Dead, replaced d1206, q652, and q1343Intermittent 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.
SONYKV5300
No tuning operationThe channels would not tune in on this unit. also the channelindicator lamps would occasionally all turn on. we found ic135/lamp driveto be defective.
SONYKV2649R
No uhf reception, replace ic002Unable to get uhf channels, vhf low, high ok. traced problemto ic002. logic output on pin 2 was +12v, should be 0v.
SONYKV2648R
Shut down, replace ic601This unit shuts down about every four hours. we found the135v line going high. dm7/ic601 was found to be thermally intermittent.
SONYKV2647R
No manual operations, leaky d-2251Set 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
SONYKV2145R
Shut down, replaced hvrThis 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.
SONYKV1946R
Intermittent audio, replace l202Intermittent audio, sometimes would work for a few minutes andsometimes for a week.
SONYKV1941R
Poor picture and unable contrast operation, replaced dl301Unable to change contrast, picture looked very weak. founddelay line video output low.
SONYKV1915
Intermittent dark picturePicture goes intermittently dark. tap neck and picturereturns.