Back in November I had one of the lenses fall off/burn out and it cost me $250 to repair. Not cheap, but cheaper than buying a new TV. About 2 weeks ago, I had 2 more burn out and have no sound out of the TV speakers. It's in the shop again (this time under an extended warranty I purchased after the last breakdown) so fortunately I don't have to pay this time. The guy who's fixing it told me about the back light thing. He said they see this issue constantly because people turn the back light all the way up because the picture looks best that way, but unfortunately crap these tvs out alot faster. He did say that adjusting the brightness won't effect anything, just the back light