Just renting this apt that has a 1999 Phillips TV model #PL9127C101. The TV has only a coax cable hook-up and no remote. When I hook it up to a RF modulator and the DVD player, I can get it to play on Channel 14 but no sound. I have tried a different modulator and DVD player and get the same results. Also the TV does not display Channel 3, just Channel 4, but that is a local station. Any suggestions?