Question about Sony FD Trinitron WEGA KV-24FS120 24" TV

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Sony TV - No picture

Gradually the picture has been taking longer and longer to come on. Now it does not come on at all. But there is still sound.

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If the picture slowly fades on, the you may have a weak picture tube or a loose solder connection in the filiament circuit. If the picture flashes on then you may have a problem with the High Voltage/Horizontal circuit. This type of problem could be caused by a loose solder connection on the horizontal driver transformer. There are several other problems that could cause this type of problem. Stargazer

Posted on Jun 02, 2007

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Posted on Jan 02, 2017

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There are two possibility for this fault. The first one is, with its CRT base connector sockets. If this socket is bad, an out of focus picture will be displayed at first switch ON, which will gradually gain focus after some time, say, 15 to 30 minutes. If the humidity of atmosphere is high, it might take more than this specified time above, and might take up to an hour or so. Replace the CRT base sockets, and check first. The vertical rolling might be due to insufficient supply voltage from the power regulator board, and should be checked after you have rectified this out of focus problem.
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The bias supply to the CRT may be failing, or the CRT itself is failing. It is difficult to detemine without going in to the set and taking readings, and diagnosing the exact things that are going on.

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It sounds like you may be on the right track. Also you could have a problem in your Horizontal Deflection circuit. Since you say it flickered, you may have a solder joint that was arcing. Probably in the horizontal circuit. I found a capacitor which was arcing in this circuit. I was a small disk type. NOW since it is chirping, the horizontal output transistor may have shorted placing too much of a load on your power supply. The noise you hear is the power suppply trying to start. Stargazer

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