I want to know too! My son moved my Jensen to the bedroom for me and I know that getting it off the wall has something to do with that cable but I can't figure it out even though I know it's simple.
I think the Jensen really is made for travel because I've just been letting it hang when on the road and it's been fine whereas the "smart" tv I put in the living room turned dumb after a few road trips.
2015 Eagle HT 26.5 RKS
1999 Ford F250 XLT SuperDuty Power Stroke V8
Reese Revolution and old Lil Rocker
Mocha May & Max - Chesapeake Bay Retrievers