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Let me get you a copy of the wiring for the tvs on this model. Click on the attached link for those coax diagrams. You might have to pull out the faceplate and double check to be sure it was properly wired at the factory. Sometimes this is where the problem is. Hope this proves helpful here. Please get back to me if you need more as all follow ups are included in our fee. http://www.winnebagoind.com/diagram/2013/13_wire_110138.pdf
Click on the attached link for the various t.v. hookups. See the last few pages for the cables. http://www.winnebagoind.com/diagram/2013/13_wire_180921.pdf