From your description, I assume the TV is broken. If a direct cable feed to it from the campground source isn't recognized, then no amount of cable diagnosis is going to make it better.
The support group for this problem is the dealer, not Keystone. If the dealer won't help, then you have even more (and larger) problems.
There is lots of confusion and some problems related to the TV wiring in the newer Montanas. Use the "Search" function to query on "TV wiring". One example result is this thread.
http://www.montanaowners.com/forums/showthread.php?t=35531&SearchTerms=2010,tv,wiring, diagram
Lastly, here is a link to the 2010 TV Wiring Diagram.
http://www.montanaowners.com/forums/showthread.php?t=38649
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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