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I have an thought.....Most dvds tell the DVD player to output macrovision. Most VCRs see macrovision and can't cope with it. The video AGC can't lock in on the distorted sync, and sometimes this makes the vcr mute the audio and/or the video.
RF modulators cost about $10.00 new and they will sense video from the DVD player and use that to decide whether to turn on and override the incoming cable, or turn off and all the cable to pass through to the TV. They are a lot smaller than a VCR too.
You could take the modulator out of the VCR, and install it in the DVD player. You probably need +5 volts to make it work, but if you check the connections in the VCR before you start ripping it apart, you'll know which pins need what voltage or signal. This method won't care about macrovision.
If jpdylon is right and the VCR is pooched, that last option may prove to be a waste of time.
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