I have a digital audio out on my tv (Mitsu WS55111 - Platinum). The manual says that I can take this out to my receiver (Marantz 7200) to enjoy surround sound e.g. VCR goes to TV and TV pipes out the sound back to the receiver (avoiding multiple cable splitters) and into one of the digital coax inputs (of which there are 3 + 3 optical). I've set it up and cannot get any sound! I've checked out the TV and receiver menus and either all the coax inputs are dead or the TV doesn't know to send out the audio signal...Any thoughts? Thanks!