I've been trying to connect my DVD player to my new Denon receiver (AVR-687) through a digital cable for a couple of weeks now. The audio works fine through RCA cables but when I try to use a digital cable - nothing. Until today I only had two front speakers but today I got a center channel speaker and next week I'm picking up a sub. Again today I tried the optical cable and no sound. I have the input setting on Auto - do I need all 5 speakers and the sub attached for the receiver to recognize a digital signal? I've trying assigning both optical 1 and 2 as well as the coaxial cable inputs but again nothing. Any help or suggestions would be greatly appreciated.
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There might be several problems. As the projector has component only connections and the DVD player none, then if the Receiver has component out, you can hook it up to that. If the receiver has HDMI inputs then you can connect the DVD player via the HDMI socket to it. The Coax sockets on the DVD player will be for sound. Number one should be connected to Digital coax 1 and assigned for it.
It's possible that the sound on the DVD player is switched off on the coax or has the wrong format selected. You will need to see the player's menu for this, so if you can't see the screen using the projector, connect a TV instead.
However if the receiver has no component out and no HDMI sockets you will have real problems connecting the DVD and using the projector with it. Though you should be able to hear the sound via the Denon.
I understand, it's something I've misunderstood on my denon avr-790 as well when connected to a samsung 8000 series led tv. The answer isn't in the receiver's settings (you can be on whatever source you want on the receiver end when toggling the menu). You need to toggle through the tv's sources to find the menu (usually found on hdmi 1). I've spent towards an hour recently troubleshooting only to find that it was the tv's source that wasn't set properly and I was trying to change the receiver's settings instead of the tv's source. Hope that helps!
The video cables--the green, blue, and red ones must be connected from the video OUT portion of the DVD player to the Component 2 video IN of the Denon. It could be the handshake between your Denon and your television. Do you have anything else to connect to the Denon to see if you get a picture? How are you connecting the Denon to the television? Make sure you have your television on the proper input and check the cables going between it and the Denon.
I guess you could try y cable adapters for input on the Denon. Might get messy. Try radio shack and pick up 5 y cables for the speakers and 1 for the sub. Someone probably makes an audio switcher that handles that as well.
What you need to do is connect all your devices to the Denon Using the best connections (Yellow Video=OK, S-Video=good, Component green-red-blue=better and HDMI=best. if you do not have a DVD that upconverts to 1080i or p when using HDMI, I would use component cables where available from your devices to the Denon other wise use the next best connection available and if connecting digital audio make a chart of all connection so you can setup everything when your ready for programming the Denon
If you've done that already and still no response from your system, I would suggest to take back to the place where you bought it and ask them to check it for you. Tell them that you follow the user's manual to the "T" but still unable to make it work.