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I have an older Panasonic 26 inch tv the screen was a bit warped at the top off and on then the picture shrank to a bright horizontal line then went black the sound remains.

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This is a common vertical circuit failure and if you had distortion at the top before,that was the capacitors in the circuit failing which filtwer the voltage to the vertical ic which has now failed as well.A lucky fix maybe just resolderingm the ic pins! A reputable shop may able to repair for less than $100 or I can guide you further to fix your self if you have technical expertise.

Posted on Jun 04, 2010

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Hello
You have stated that your TV has a lot of horizontal lines before it went off picture. We say that lines as retrace lines. So many of them will there on the entire screen, at about one inch or so apart, horizontaly scattered along with picuture. At that time, you may be unable to down the brightness control also. Even though you have reduced the brightness control to zero position, there will be some brightness level on the screen. You should have to repair that fault at the begining. There is a voltage going to the picture tube base, known as screen voltage. That voltage determine the emission of the picture tube, and we call it a bias voltage. When it goes higher than normal, this trouble ie retrace lines will occur. In long run it may spoil the picture tube itself. I don't know what the case of yours.
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Is this a Horizontal line (inch or two) across the screen, if so
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