I'm new to my Bounder 35K, but it has a box that lets me send the same source signal to all tv's or a different source signal to each tv. If you have such a box is you're wayward tv getting the same source signal as your other tv(s)?
And, what I'm suggesting may have nothing at all to do with your situation. As I said, I'm new to my Bounder. I've had it only since June 7.
Hope you get it worked out.
Andy