I apologize for the delay of a response.
I don't think the DVD player did anything to the television. It may have been a board in the television that went bad.
You shouldn't be afraid to play another DVD. It may be entirely possible that you got a TV with a bad board, or was damaged in shipping.
--HDTech
I purchased an LN40A750R1F (40" 750 Series) last Saturday. We love the picture! Then yesterday my wife and I were watching the a DVD on our new Sony 5 disk DVD player (connected by HDMI). There was a loud noise through the TV speakers. I pulled out the DVD. Then there was no sound from the TV on another DVD, the cable HD through the 5 component connection, or the regular TV source. I have the TV hooked to my Yamaha amplifier with a optical cable. I couldn't get any sound from the the TV through the amp either. I returned the TV to my retailer and got another one, but now I'm wondering if the DVD player did something to fry the circuit board on the TV? Could anything else have cause the problem? I'm now a little reluctant to try another DVD.

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