We have a Jensen TV that works on 12V in our coach that I was wanting to replace. As of yet, I have found no other TVs that work on 12V (although I have not done an exhaustive search). Some flat screen TVs have a DC input, but they are a weird voltage, 17VDC or something like that. Most TVs though only work on AC.
Sounds like the switch box may have been bypassed for your outside TV.
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