Go to settings, select TV Inputs, choose Antenna/Live TV, then 'remove antenna/live tv'. Then turn on the connected DVD player (I put a dvd in and pressed play just in case). Then go to Settings - Inputs - Add Antenna/Live TV - Scan for channels - it will ask if you need channels 3 &4 - Say Yes. Then it takes a while to get through the channels - "Finding Channels". Go to Settings again - TV Inputs - AV should now be one of the choices - I cannot remember what I chose next - may have been "Add" or "Show Input" - something positive. Then go to the HOME screen - then you should see "AV" as one of the tiles. Selecting it should show the DVD playing.
Well, I was frustrated about no sound but accidentally used the ROKU remote and VIOLA! sound! I can turn it up and down and mute but not freeze or fast forward or back. Still, better than nothing. Have no idea of settings. Is Samsung dvd and JVC Roku tv.