How did you get this fixed ?
Im having the same exact problem.
Bought a Samsung LCD tv from Sears about two years ago. Model #LN46A630.
Just recently the screen has gone bright white on me. Turned off the tv for a little while and turned it back on. Worked fine then went back to a bright white screen. Can still see and hear tv, just the shading is very bright white. Unplugged it and left it alone over night thinking maybe this will reset it and nothing.
Played a DVD hoping it was my cable box and still the same problem. I called 1800-Samsung but she was no help at all. She logged it in the computer and verified my tv was two years old and that the warranty expired a year ago. She advised me to take it to an authorized Samsung repair dealer. This was on a Friday night.
Well the TV worked fine for another week then its white again. And again its on a Friday night so I have to wait till Monday to call. I will keep you posted. Anyone have anything similar happen and have a result to fix this please post up.