Don't know how yours is wired, but I had the same problem and found two causes. First, a cable in the entertainment center area was not properly connected - loose connection (nut not tightened). Second, our rig includes a fancy input source box for determining what source goes to the TV's cable input. It was set to something else ("antenna," I think) and the TV could still find some, but not all, channels. Hope this helps and that the problem is not somewhere in the coax installed in your rig.
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