TV goes black at bottom and has horizonal lines in middle?

I have a Sony Trinitron several years old. Turned it on and the screen went black at bottom and had lines in the middle of screen. then it would go completly black and I can turn it off and the picture will come back on. When it does this again I can tap the side of it and the picture will be normal. I have to do this several times and so far as long if I don't turn it off it works finefor the day. I took the back off and I noticed when I barely touched the wire going to the flyback it would work normal. so i turned it off and pushed down on the wire and I felt it click when I turned it on it worked normal till the next day & it started again. Talked to the guy at the TV shop he said that was not my problem that it was when I moved the wire to the flyback that I was moving the circuit board. He said I had a bad connection on the board from the horizontal chip. Before I take it apart and start checking sodier joints has anybody got any suggestions. Thanks

William Haywood Apr 13, 2007

Pulled the board out and checked the solder joints and found that one of the legs on the horizontal output transistor had never been soldered. found another one on the board that was not solderd. made the repair & wiggled the board. The TV works great. Thanks for your help......BILL

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Hello, please check the high current area around flyback transformer, horizontal output transistor as well as the deflection connector for bad soldering. Best regards, Arpi If you need more info please advice.

Posted on Apr 12, 2007

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