Sounds like your TV has coil wine. I'd see if you can get it on warranty, just get it replaced if its free.
According to the technician from Samsung, the warranty is up in the end of July and he said it could take up to 30 days to get the part in. I decided to call Best Buy and they will pickup the television for a refund. I found a 56" model with the same specs for the same price in their store.