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Lines across the top of screen - Sylvania Televison & Video

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If this is a picture tube set (not a thin screen), then you have a bad electrolytic capacitor in the vertical circuit. Just about all picture tube sets that I've worked on that get lines at the top was caused by a bad or leaky cap and is a common problem w/ most sets. There's a very slim chance it could be the vertical ic but normally when it goes bad you will have nothing but a thin white line running across the center of the screen from left to right. If it's just a capacitor, the part would only cost a couple of dollars at most, however there's no way I can tell you exactly which one to change w/ out looking in the set. A repair shop would probably get between $30-$50 to fix it. If you can give me the model number of the tv, I can see if I can you some more info.

Posted on Jul 28, 2010

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Posted on Jan 02, 2017

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So I have a 50 Lg ( LG 50LN5700). There is still a picture however about every 3 seconds it goes from regular to blurry and repeats. There seem to be about 3 black lines across the top horizontally about 3...


To clarify, are the 3 black lines horizontal (left to right across entire width of screen)? or are the 3 black lines vertical (top to bottom across entire height of screen)?

Horizontal lines are almost always the result of a failed panel, and no board replacement will fix the issue.

Vertical lines such as you have described (only 3) are probably also a bad panel. If the black lines were evenly spaced in a repeating pattern, it could be a mainboard or TCONN board.

Has this panel been cracked? or perhaps cleaned recently with too much water or cleaning solvent that has gotten the screen wet?

You may have to sell the TV for parts.

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Adjust your convergence. Under menu I think its the last choice at the bottom of settings or picture menu

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This is usually caused by bad capacitors in the vertical circuit. If you have an electronics background you should be able to find the defective ones with an ESR tester .

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Horizontal white lines across top of TV screen


Hi I had the same problem. Broken white lines across the top of the screen. This is called overscan. You need to go into the Setup menu, other settings. 16:9 overscan needs to be on. Hope this helps.It solved our problem.

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It is a calibration problem, let me see if I can find some schematics for your tv.

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Inverter board is bad or video cable loose either behind LCD panel or near video adapter.

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1 Answer

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Check Vertical output IC circuit for bad capacitor.............
also vertical power supply for bad cap....Last----replace IC...

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