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1995 is a little on the new side, but I would guess that the picture in picture board has gone bad due to leaking surface mount caps. Depending on how bad it is, they can be replaced and the board cleaned up. It's also possible to bypass the PIP board if it's too far gone to repair. Mitsubishi sets are also known to have lots of other caps leaking, so it may not be worth trying to fix.
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