I think there should be a cable from the DVD player to the TV, usually with RCA type ends on it.....Usually yellow but that does not matter. Yellow is standard for video while red and white are for audio. You can also usually get a cable with two RCA ends going to a 1/8 inch stereo male connector to pipe the TV audio through the stereo system. Radio shack probably has the cables you need for a few bucks.
Hi, Had same problém with my Eagle HT. Had to take face plate off around dvd player asnd unscrew unit. Had to add red,white, and yellow cables between tv and dvd player. You'd have thought they would have done this at factory! Good luck!