legnaz,

Sorry to hear that you're having issues with your LN-S2641. Unfortunately, I don't have any way of really being able to diagnose the problem. The symptoms you describe sound like they are better addressed with a technician or our help desk.

I wish I could help further, but they would be your best bet - and be able to tell you if the unit is still under warranty. If I can help out further, please let me know.

--HDTech