I have an older Mitsubishi TV model WS-55807 and I'm trying to hook up a DVD player on it. I want to hook it up to one of the inputs in the back that have a video and two audio female connections. The DVD player (Phillips BDP2105) only has a coaxial output. I tried hooking up a cable from the coax into the red female input (mono) but it didn't work. I can get picture but no sound. Thanks for any help.