I've had the same problem with the sound going in and out for months now. I took it to my local electronics repair shop for repair and they said that they fixed it. It was fine for about 2 days. Today, I read this message and ended up repairing the problem myself. There was five spots that had rings/cracks at the RCA jack solders around the base of the motherboard. Very simple fix - I had to go out and purchase a magnifying glass, so it took a little longer. Thought I'd see without one, not a chance! Thanks to people like this who post these comments - others can save money rather than purchasing another $300 - $500 item!
P.S. (Refer to 6) It's is easier removing the three screws that hold the Coax Antenna to remove the cable from the coax antenna box (not removing the cable from the mother board). There is a better chance of not breaking the wire.
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