I can't make diagnostics on the site, but perhaps someone else can. The best way to know is to have a service technician come out and take a look, and you can get that set up at 800-SAMSUNG. If you are out of warranty, I don't believe the diagnosis is covered.
My Samsung DLP TV seems to work fine for about 10-15 minutes and then the screen goes black with little white pixels. I just replaced the Bulb and still don't know whats wrong. Anybody have a diagnosis on my problem?
p.s. i have pictures if they help.