This actually happened to our (mine and my roommate's; for those just tuning in, I do not actually live with my family in that pink-walled trailer anymore) TV. The entire top half was dead, there was a bright horizontal line that appeared to be trying to be the entire top half of the picture, and then the bottom was fine.
So my esteemed roommate watched the picture-in-picture for a few days. I laughed at his inability to stop watching TV when it was obvious that he wasn't going to get much quality watching in. And thus, inspiration hit me in the face with a cream pie.
Actually, I'm glad it didn't use a cream pie. That would've been heck to get out of the carpet.