OK. This is what the problem is. I have the exact same tv and have experienced the exact same problem with mine. As a matter of fact, i am going through it for the second time as i write this now. About a year ago, our tv did the same thing. I called samsung, and explained what the tv was doing. At that point they advised me that it was no longer under warranty. However, For this issue i was entitled to a one time free repair. I'm now realizing that they have obviously been having problems with this particular tv. So they had me call their repair office (it was a sub-contractor pro-tronic i beleive the name is) and set up a time to come to my house. The guy showed up on time and was very quick about making the repair. You should know that the problem with our tv was a blown capacitor on an 8 by 8 inch circit board that i did see for myself. He all ready had the replacement board in his tool pouch when he came to the door. It took about 15 mins start to finish to replace. Worked great
For about 2 months! ***? Same crap. Won't come on. I was P#ssed off! I called again just today, and this time i have to pay for it. I won't know how much until i talk to the repairman when he calls. But believe this. I WILL be expecting at least a year warranty for the repair. Because who's to say this won't happen again in another month? You should do the same especially for the parts cost. Because they obviously used crappy parts to do my repair. Here is their number to call. 1-800-samsung. Make sure you have the model # and serial # when you call. Good luck to you.