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My tv has horizontal lines in it when I turn it on. It clears after 20 min?

When I first turn on my tv it has horizontal line on it. After about 20 minutes it'll clear up. What can I do to fix it. Someone told me I just need to replace the transformer. But I have no idea what that is. Please help. It's a Mitsubishi brand tv. It's a 50" screen, probably about 8 years old.
Marilyn Lomahaftewa, December 2007
oops silly me I read your complaint wrong. It could still be a faulty vertical output i.c but more likely a capacitor that has dried up/changed value within the vertical output circuit which isn't bad after 8 years.

Tony, January 2008
oops silly me I read your complaint wrong. It could still be a faulty vertical output i.c but more likely a capacitor that has dried up/changed value within the vertical output circuit which isn't bad after 8 years.

Tony, January 2008
It sounds like a bad solder joint on the scan coils plug/socket or the frame/vertical output integrated circuit and this would be first course of action to check. Sorry can't be more specific.

Tony, January 2008
link Click here to see other fixes for Mitsubishi.