Possible hairline crack at the solder points of the sound/audio board. These boards are placed in the TV with NO back support, so simply pushing in any cable in the ports in the back will bend the board and crack their cheap solder connections.
The fix is to either get another board or carefully try the xbox 360 red ring of death heat gun fix. You tube this to see how it's done first and DON"T do it if you are not willing to replace the board with another if it fails because if not done perfectly, you could damage the board further.
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