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
SONYKV1713
Picture distortionShort width - from 1/2 to 1 inch. problem starts as pinproblem. servicer then finds picture just a little short of width. mayhave been like that for some time.
SONYKP5040
Mechanical misoperation, greased small gear shaft bearingsThe door would open only halfway and the motor would shutoff. the door would not close more than 2 inches before shutting off.there was no grease on the small gear shaft bearing.
SONYKP5020
Overscan green crtGreen tube was overscanned. traced problem to q5337.transistor was leaky from collector to emitter.
SONYFD20A
Dead, repaired cracks on boardSet came in dead. no power, whether using batteries or acadaptor.
SONYKX2501
White vertical bar on the picture, see circuit change belowWhite vertical bar about three inches in from the left side of the screen. it would go away when the pc boards were opened out to the service position.
SONYKV2649R
Intermittent power on/off, replaced d021Intermittent power on/off. customer controls erratic.found d021 leaky on mt board.
SONYKV2649R
Volume low, replaced t205At maximum volume setting, the volume was about 1/3 of normal. inspection of sound output signal at pin 14, ic201, revealed avery low level signal.
SONYKV2647R
No signal reception on chs 11 and 13, replace ic-002Could not tune in chs 11 and 13. all other channels ok.
SONYKV2647R
Shut down, power modulePower module causing high b+, shutting the set down. uponreplacing power module, noticed non-linearity in the bottom half of thepicture. top half of the picture was fine.
SONYKV2643R
Shut down, replaced d502 on a boardUnit would shut down when the voltage of d502 dropped below4.8v. in the schematic pin 9 of ic501 shows 5v. proper voltage shouldread 5.8v. in turn d502 would read 5.6v. when the voltage at d502dropped to 4.8v, waveform was distorted and unit would sh
SONYKV2145R
White h band on the screen, r520 increased in valueAfter ten minutes of operation, this receiver displayed aone-half inch white horizontal band at the top of the screen. verticalsize and linearity were not affected.
SONYKV2142R
Snowy picture, replace d2214, q2224, q2220 & uhf tunerSnowy picture on all channels except ch. 2. the reason youwould get a clear picture on ch. 2 is due to the low voltage used onch. 2 coming through the uhf tuner.
SONYKV1952R
Picture distortion, c544 openSet came in with narrow picture, pincushion distortion andvideo smearing. the 200 volt line measured about 140 volts.
SONYKV1948R
Vertical roll on weak signal ch., resoldered r581Vertical roll on weak signal level. no problem on strongvideo signal.
SONYKV1547R
Vhf channel fade outAfter 30 min. to 1 hour of operation, low vhf channels fadeout.
SONYKP5040
Intermittent mechanical operation, poor ground connectionIntermittent door opening. s953 on the motor: one side ofswitch was not tight due to no threads.
SONYKP5020
Poor focus after warm-upAfter warm-up, picture would go out of focus. found redpicture tube focus shorting inside tube. this caused blue and green togo out of focus, since all three tubes (focus) are connected to the sameblock.
SONYKX2501A
Beat pattern in the picture, re-routed cables p2 and p3There was a beat pattern in the form of a 1 inch vertical lineabout 2 inches in from left side, on ch. 7 only. moving the ac cordwhere it was connected to the d board would increase or decrease theproblem.
SONYKV5200
Raster with retrace linesSet came in with all white raster with retrace lines. audiowas ok.
SONYKV2654R
Picture up/down button stuck, replace s004/005/006Picture up button was stuck. therefore volume up/down andpicture up/down or channel up/down would not work. found picture upbutton was worn. this switch was spring loaded in rather than out.