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
SONYKV2675R
Crt arcing and vertical roll, crt socketSet would arc (more like a loud tick noise) then picture wouldvertical roll for about 20 to 30 seconds, until the next ticking noise.
SONYKV2650R
Snowy picture, replaced band switch ic002The set would occasionally tune in the vhf low channels. allother channels were snow. we found the band switch ic to be defective.this is becoming more common problem with the units using the la7920 ic.
SONYKV2649RX
Mislanding, removed shortWhen viewing pix at low brightness, the edges of the rasterappeared reddish in color. inspection revealed slight distortion in redinput signal to video drivers. i found the output terminal on the avboard had a lead shorting to the junction of r12 and r
SONYKV2649R
No vertical deflection, replace c508The set had two problems. no vertical deflection. thewaveform at pin 7, ic502 was pulsing, all the voltages were fine. foundc508 had a 47uf instead of a 1uf that the manual calls for. the secondproblem was no high band. found the uhf and vhf output
SONYKV2145R
No v deflection, replace q502/503 & r520/r555Vertical problem.
SONYKV1961
Sputtering of the audio, replaced lampOn channel 7 only, you would hear a sputtering of the audio.
SONYKV1952RX
Dead, replace hdt t501Unit came in dead, found horizontal output (2sd1938) shortedand fuse open. after replacing output transistor and fuse, foundincorrect waveform on horizontal drive transistor. found hdt (t501) tobe defective.
SONYKV1946R
Intermittent shut down, leaky d502Unit would shut down intermittently.
SONYKV1924
Spot burning on crtSet came in for a burnt spot center of screen (size about1/8 inch). servicer replaced picture tube and after two months set camein again, same problem with new tube.
SONYFD20A
No picture, replaced leaky c603No picture.
SONYKX2501
Intermittent shut down, replace hvr blockUnit would shut down intermittently.
SONYKV9200
Retrace lines on dark screenThis unit had retrace lines with brightness control turneddown.
SONYKV5300
Tuner assembly touching fuse holderTuner assy touching fuse holder f601. repaired six units withsame problem.
SONYKV2675R
No vip, reset procedureSet snaps then vip will not work, screen scrambled (1 end-user, 2 dealers). also, ic104 (cx7958) will kill remote (another set).snapping seems to come from pix tube. -hq comments: as a first approach to the problem, please perform thefollowing reset pr
SONYKV2670R
Incorrect display (aux) on the screen, use kv-2675r remoteOn screen display the following display selections muting,sleep, channels were displayed but aux. appeared also. this happenedwhile the dealer was demonstrating the kv-2670r and i was observing.end-user came in also and wanted to know how to get rid of
SONYKV2670R
Unit will not shut off, "a" board ic-103 replacedUnit will not shut off.
SONYKV2648R
No picture nor sound, resolder inside prescaler(btp981)No picture nor sound, snow, vc control not working (0 volts).
SONYKV2145R
Pic folds over at top, replaced d504/505/506After two hours, picture folds over at top. replace 10kΩ resistor (r520) as per form of feb. 1984 but problem still occurred.
SONYKV1975R
No vip function, replace ic105Two units without vip function. remote, pix, sound andchannel display ok.
SONYKV1975R
No vip function, reset ic 105Servicer had two kv-1975r in which vip would not function.used the following procedure to reset the vip circuit.