We have a 351DS, assuming main TV is living room, ours has 5 mounted TVs. I had the same issue, however it wasn't the TV, it was the switch box. I bought a new one on ebay or Amazon, can't remember which. The old box had a small crack on the board, almost not visible.
Do you other TVs work? Ours all did, only one that didn't was the living room.
Now for taking it off. I felt like I was gonna rip part of the wall off. With a hand on each side of the TV, VERY firmly force it up. It felt like I was gonna break it but it came off.
Good luck.
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2015 Georgetown Forest River 351DS Class A
2008 Keystone Cougar 293SAB 5th Wheel
2007 Jay Flight 30.5RLS 5th Wheel
2006 Jay Flight 29BHS TT
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