I want to connect my Denon av1500

SOURCE: how to connect using a LCD monitor, cable box, DVD player

You won't need the VCR, that's only used for a cable box, and since you have one now there is no need. You'll want to connect everything with the better video plugin possible. Composite (red, white, yellow) is the worst, then s-video, then component (red, blue, green), then DVI, then HDMI. That will square your video. Then send all audio signals to the Denon. These cables are usually the red and white cables. OR Plug everything into the Denon to the appropriate input. Then connect the monitor to the video out of the Denon.

SOURCE: No sound from digital cable thru AVR3200 after adding HDTV - DVD plays fine

you need a digital coax cable and then connect it to 6.1 also the digital cable type is not a coomon type so check that also

SOURCE: Speaker crackle

HDMI is a High Definition Multimedia Interface and has the capability to transmit both AUDIO and VIDEO all in one cable. Your setup right now is transmitting 2 audio frequecys (L/R stereo RCA and HDMI) into the Denon inputs. Not necessary! I would recommend eliminating the red/white audio cable from the direct tv box to the Denon.

After doing such, your receiver should be able to process audio/video signals appropriately. REMEMBER to unplug all POWER CORDS before reconnecting any speaker/audio/video cable, as it may cause a small electrical surge and fry a micro component in your system!

SOURCE: hi denon to cable box to samsung lcd

Unless you are having res. issues you can use component / optical / coaxial cables to connect all your devices to your denon and from your denon to your tv using component cables also

SOURCE: Describe your Denon AVR-3805 7.1 Channels RecI

There is a button on the front of the unit under Input its a mode button press this button to select auto that should give you sound