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I own an early 90's 50" Mitsubishi TV. I know not many have a TV like this these days, but I want to know if anyone has had an issue like mine.

When I first turn it on, I get horizontal lines across the TV. They will move up and down, sometimes they're bigger and smaller. Sort of how back in the day when you didn't have access to a certain channel and all you see are the lines on the screen.

After about 15-20 minutes, they seem to disappear sporadically and the screen becomes fine. There are no issues with the colors, just the horizontal lines.

Has anyone else had the same issue and what did you do about the problem?