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Hi. On that model you may need to change the tv to the VIDEO setting. Have you tried that?
Do you have more than one input on the coach? Some do, and that can make a difference. And look at the place on the wall where the cable hook up is for your box........is there a switch there for selecting one or the other?
Then I would just give Tiffin Customer Service a call and ask them for some assistance. I am attaching a link for that site for you. Sorry I couldn't offer more on this. Please get back to me and let me know what they had to say. Thanks! http://www.tiffinmotorhomes.com/contact
Just checking back in to see if you were able to get some additional information from Tiffin on this issue?