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When t.v. is turn on ,single horizontal line appear on screen.I know it's in vertical section but i can't identify the vertical section .I need a schematic diagram.I really appreciate if you can provide me a schematic diagram. I'm not an expert yet.
Could be serious...but first check the screen modes (for split screen, format, etc) to be sure the tv is set up properly for the picture you are trying to watch. Switch the input to a DVD or something similar. Is it the same? If not, you have a mode/resolution problem with the tuner and perhaps some other device.
Your having trouble with the vertical sync/deflection circuitry. Probably a driver since it clears up after it gets warm. Could be as simple as a cold solder joint but it's not something you can do yourself unless your a tv repairman.
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