What I might suggest is registering your television online. This may give you an additional 3 months of warranty. You can do that here:
And then calling 800-SAMSUNG to see if you can get an extention for a repair. It's possible that you may be granted one, but I can't guarantee that. Otherwise, I'd suggest having a repair technician come and inspect your unit.
I have a Samsung HL56A650C. It is one year and four months old, and it is turning on and off continuously. I had to unplug it to make it stop. It turns on and off approximately every five seconds -- not even long enough to get a signal from my cable box. I thought it might be the lamp, but I replaced it and the tv still does the same thing. Has anyone found out what is causing this problem??