Glad you got the TV removed ok.
As for the Concertone P.O.S. 600,
You have to remove the face frame and there are usually 4 screws holding it to the cabinet.
There is an 'in-line' fuse there.
That may or may not be the problem.
It's a real ratts nest of wires there, just hunt around....you'll find it.
Some folks have had success disconnecting it for 15 min or so and it it coming back from the dead.
These units are know for their pre-mature deaths.
There is a fella on this forum now (in the concertone section) who might be able to help you with your problems.
2009 Flagstaff 8528 RKSS
2007 Toyota Tundra DC 5.7L V8
Pullrite Superglide 14K
Air Lift 5000
Prodigy Brake Controller
"I've got a mind like a steele.. a......a steele......um.....uh...... what's that thing called again?