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Re: sony 36 in.tv
This is usually an indication that the picture tube is starting to fail. A short term "cure" is to increase the screen voltage a bit. This is done by opening up the back and turning the screen control on the flyback transformer clockwise slightly. The flyback if the large part with the red wire coming out of the top that goes to the side of the picture tube. Please note that you only have to turn this control slightly. Ity should be the top control on the two on the flyback. The other is for focus. Also note that there is extremely high voltage there (15,000V) that can be dangerous. If turning up this control resolves the problem, you have bought yourself time to find a replacement only.
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you could be experiencing two problems. the first part of your description states the static with two horizontal bars, this problem is usually erratic and it is caused by a defective varactor tuner(this happens while watching a channel thru your channel selector) the second part that it also happens while using the front hookups could be taht the front input connectors have developed some loose solder connections and thus the video problems (very common problem)
3 years ago, i had the same problem with a samsung 36", when i switched it on it would stay on for around half an hour, i tried to switch on straight away, but it wouldnt, i had to leave it for an hour or so, then it would stay on for about 5 minutes. And the same thing the next day (half an hour then 5 minutes). I left it into the repair shop, it had to get a circuit board replaced at a cost of £315, dont know how much it will cost to get fixed now, as i could buy the same tv for a little over that now.
tap around on the circuit boards in the rear of the television. narrowed it down to the Comb Filter circuit board. It is the smallest upright circuit board behind where you plug in all your connectors. pulled it out cleaned it off, reinserted it
The set may have shorted the horizontal out put transistor since it kept coming on sometimes. This could be cause by the driver transformer arcing causing a "spike" in voltage going to you horizoltal out put transistor.