I'm in the process of buying a used rear projection TV. I know one of the things to look for is screen "Burn-in". What does "Burn-in" look like when your watching a rear projection tv with this kind of damage. I recently saw a nice 53" Hitachi (2001 model). When this Hitachi is on, it looks like someone took a pink magic marker and drew a happy face on the "inside" face of the screen. Does this screen have burn-in?