Ours has a strange problem. The top 2" of the picture show what seems to be the two scans of the interlace are out of sync or something. When the screen is blank/black (playing just music through the TV), that area has every second line slightly lighter. When viewing a show, that area still has individual lines visible, and sometimes appears to contain an upside down part of complete image overlayed/interlaced with the normal image.
I used to even fix TV's, but that was about twenty years ago and it's all gone rusty, and I never had such a problem before. I don't want to spend too much time tinkering, because it's my mom's set, and she will worry about me making something worse or breaking it properly, so I was hoping to find an electronics enthusiast that might grok what is happening and know where I should look.