As others have mentioned, the TV does come off the rack fairly easily. I didn't pull the chain, but instead looked from the side and found the metal frame had a release. The wires were all connected on mine from the factory. The DVD player is source "AV." I find the remote control finicky and a little slow to respond, so I hit the button again and then it goes past the source I wanted...
Also - just to make sure - you are using the Jenson remote to scroll though sources and then the iRv remote to control the dvd player and volume?
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