Yup, no down conversion....just hook up the dvd's video to the tv directly. Or use the svideo output on your DVD player.
If you hook up your digital cable to the receiver, then you have to turn on your receiver for sure.
The other alternative is to hook up your cable box to your TV, and use Y adapters to feed the sound to the receiver simutaneously. Then you have the option of hearing the sound on your TV or receiver.