I have a off brand 42" Plasma, Harsper (Samsung components), the picture is perfect to start with, but after awhile (could be 1 hour or could be fine for 4 hours), the screen gets very distorted. It's hard to decscribe what it's doing, but looks like a negative picture from film in a camera. I have a picture at the following link
http://www.photoshow.com/watch/ew3Tc3PV
thanks
Dwain
