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
SONYKP5020
Incorrect convergenceAll three colors would not center properly. found d5501shorted on da board. also schematic is labelled wrong, voltage afterresistor r5597 should read +5 volts but schematic indicates +12vdc onda board.
SONYKX2501
No color, replaced ic1302No color under any input, faint retrace lines in black andwhite picture. sometimes flickering of colored snow but out of colorsync.
SONYKV9000
Tv would not come onTv would not always come on. found c508 intermittently open.
SONYKV2648R
Color confetti on b/w, adj cv301Color confetti on b/w telecast.
SONYKV2648R
No picture, replaced f601, q602 and q603This unit keeps on blowing f601 and q602. isolated problemon the f board by disconnecting the 135v b+ and supplying a separateexternal b+ (tp92 was the ground return) to the a board. this makes thea board work. hv normal but no raster. then by using
SONYKV2648R
No manual operation, replace c4038You cannot turn set on or off by manual button. set wouldwork ok with remote. i found no logic high at pin 33, ic4001. capacitorc4038 was shorted on mz board.
SONYKV2648R
Bottom of screen blank out, replaced cx841Bottom and left side area of the screen blanked out. foundcx841 defective.
SONYKV2647R
Black line on the screen, replace v out ic502After set would warm up a black line about 3/8 inch (veryfaint) would appear in the center of screen.
SONYKV2647R
No operation, h out q-502No sound, no picture. found horizontal output shorted.
SONYKV2643R
Vertical bars on the screen, replaced c539Vertical bars on left side of screen. almost like ringing.horizontal spike riding on b+.
SONYKV2602
Vertical jitter, replaced c511After 5 to 10 minutes on, vertical jitter is noticed andbecomes increasingly severe. sometimes a brighter line is apparent acrosscenter of screen (slight folding). found c511 2.2ufd at 20v tantalumcapacitor very slightly leaky (100k).
SONYKV1943R
Intermittent sound, replaced t207Sound intermittently goes dead. troubleshooting indicates that the sound is not passing through the if section. isolated problem to t207.
SONYKV1923
Picture noiseRetrace line.
SONYKV1923
DeadDead set. found defective the following parts f602, q901,d514, d502. after replacing defective parts it was found r560 and r561were getting hot. traced cause to an open contact between circuit boardand l502 the hlc coil.
SONYKV1914
No uhfNo uhf. found b-e of q103 shorted.
SONYKV1913
Sound only on channel 5Intermittent or garbled sound only on channel 5. because theproblem was only on channel 5 the audio ic and outputs were ruled out.monitoring q107 it was found to be muting on and off when on channel 5.nl2204 was then replaced and the problem was cured.
SONYKV1912
Channel no changeCannot change channels, push buttons will not light whenselected. found 35v missing at pin 10 of ic033.
SONYKV1746R
Dead, replaced hdtNo raster - no high voltage. servicer confused with hi-volt shut down. virtually lost scope pattern at secondary of horizontal drive transformer.
SONYKV1722
Part reliabilitySg-613 supplied was installed by service station. partfailed immediately. cones on part are not correct for use in sonytelevision. construction of part is different in appearance to partssupplied by kansas city. code on part: ok-h. -hq comments: in
SONYKV1545RS
Volume range too limitted, change r102 to 100kSound is either too low or too high. customer states thathe thinks the volume should move from low to high in a slower manner,rather than jump from low to high. -hq comments: we can satisfy the customer by changing r102 resistorvalue from 10k to 100k.