Hi Have the tv setup for hdmi in 1. On the irv 66 radio set the output to hdmi out to tv. If you want to use the front hdmi on the irv 66 to play dvd from a blue ray system. Push source button on irv 66 remote or button on the front of the irv 66 entertainment system and switch the input to hdmi front in. Plug a hdmi source into the front hdmi and start the source player. It should show up on the tv and sound will come from the trailer speakers.
Hope this helps Tim