This is a CRT , not flatscreen TV. After it is on for a while, suddenly the picture tube seems to go off. It goes black and there is a tiny bit of light in the center for a split second, like the power is being turned off. At the same time, the audio remains, but diminishes slightly in volume. Then, after a few minutes, the sound come back and the picture returns as well. This problem repeats and repeats. Now that I am watching it very carefully, I notice that in the fact the slight drop in audio volume just barely precedes the blanking of the picture, just by a fraction of a second. Any ideas? Thaks.
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Is it a tube TV or a flatscreen? If it is a tube then it is possible to correct this, however I'm not sure what caused it. Take the back off the TV, and look for the flyback transformer. It is the unit with a red wire coming out of it, going to what looks like a suction cup on the tube. On the unit there should be a small knob labeled focus. Try adjusting this. If it is a flatscreen, sorry, I can't help.
Sony incorporates a video blanking circuit that blanks the picture out when the picture tube begins to get weak. sorry, but short of replacing the tube, there's no lasting solution to this problem. I used to have some success rejuvenating the crt, but I found that it didn't last but a few hours before the blanking circuit starts to activate again.
Sounds like the red picture tube could be shorting internally which would cause the "all red" condition. In which case you'd have to replace the red tube. Are there horizontal (slightly slanted) lines through the picture as well when this is happening and a very very bright screen? If so it's most likely the tube.
sounds like a bad picture tube. Picture and bright settings cranked up for a good pic? Test/rejuv with a crt tester and/or look at the Ik signal on the crt board. A good tube has 3 small pulses during blanking. The crt cathodes are checked with these pulses, pulses too low and the jungle IC will blank the drive. If the picture fades in and out I would check the filament ckt but that doesn't support the "blinks"
You need to have the crt px tubes checked for
heater to cathode shorts, a picture tube restorer is needed to refurbish one or all three
tubes to restore balance to tubes. Sony has a
px muting built into the circuitry to save the
tubes from being destroyed. If one tube is conducting more than one of the other two the
imbalance is detected and causes picture (px)
muting... blinking on & off the picture. Most
repair shops have this crt restorer on hand.