Question about Sony KV-27S20 27" TV

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TV Black-out My TV screen goes blank but the sound stays on. The screen is on at first but reduces to a white center dot and goes black but the sound stays on. When it is turned off and put back on, the screen comes back to life. This may happen a few times and then it stays on for the rest of the evening. The frequency of the blackout has increased from once in a while to a few times a viewing. Sometimes it is okay. A tap on the side seems to work sometimes. What is the problem and is it fixable and worth it? Can I get a part and replace it myself? It's been a great TV. Thanks Franko

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  • FRANK SALADONIS Jun 29, 2006

    Thanks for the responses. I have done some electrical soldering but have never had my 27' Sony apart. Where would I find the pins for the EHT and FBT? They are probably on the board but where. I don't have a schematic unless there is one inside the TV. Any extra info would be appreciated. I don't want to bring it in unless I have to.



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The horizontal sweep circuits are at fault. There is an intermittent loose connection. It is likely a loose solder joint and it may be possible to spot if you have a magnifying glass and an eagle eye. The heavy lead that comes away from the side of the picture tube (CRT) will lead you to the Flyback Transformer area. Stay away from that wire - it'll knock the soup out of you if you don't know what it does - even with the power off. Don't try to re-solder everything in sight. You could do more harm than good. Examine the circuit board - you may be able to wiggle the cold solder joint and see it move where it shouldn't be moving. Good luck TVGUY

Posted on Jul 26, 2006

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Unclejed is right. It is a dry solder. I suggest you unplug the TV set, wait for a few minutes to discharge all the existng High Voltage charged in the Electrolytic Capacitors to discharge, and then re-solder all the pins of the EHT / FBT (Fly Back Transformer) This is the area for most loose solder for your type of problem.

Posted on Jun 28, 2006

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A tap on the side tells me that it's a solder connection broken loose, most likely in the horizontal section. if you have experience with electronic soldering, you can fix it, otherwise take it to somebody that can fix it. thermal expansion and contraction(from turning the set on and off) eventually produces metal fatigue in solder connections, and the connection breaks loose, just enough that it sometimes works, and sometimes doesn't.

Posted on Jun 28, 2006

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