Titanfan: This may be a really dumb question, but when using the TV, did you move the surround sound switch from radio to TV? Mine is a rocker switch and is located in the side wall of the passenger side overhead cabinet.
If you're changing the switch position and you still can't hear your TV then the two most likely problems could be: 1) the audio connection from the TV to the surround sound amp has become disconnected, or 2) the radio/TV switch, or associated wiring is at fault.
Roadking - Homeless, full time, wandering gypsies
Winnebago Ultimate Advantage
Harley and Honda Civic