Unfortunately, if the reseat didn't fix the issue then there's not much else I can offer in ways of diagnosis. Without actually looking at the unit, I don't have any way of clearly diagnosing it.
I'm not sure if it's under warranty or not, but you might consider calling 800-SAMSUNG to schedule an inspection/repair.
had former post concerning this tv. was advised to try to reseat the lamp. Did that and it seemed to work for a day or so. Then carefully cleaned both fans as there were really dirty. That worked one night. Still turning off. and lights still indicate the fan is not cooling. I do know the small fan at the very back of tv is working. Couldn't really tell about the other one. can you help please.