Every 20 minutes or so watching TiVo, the picture goes blank. If I turn the receive off and then back on, the picture comes back. The sound stays on. I replaced the TiVo and it still happens. Doesn't happen when watching a DVD. TiVo is plugged into VCR input.
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Have you checked to make sure it didn't restart your entire system? If not you'll have to double check everything is connected correctly, turn everything on, and change the channel on the TV back to whatever Composite video or HDMI setting it was plugged into...then make sure the Denon receiver is set to Cable
Sorry to say it, but you just need to get a new receiver. There is probably a capacitor going bad on the circuit board. It's only a matter of time before it quits completely. The only other option is to take it to a repair shop where it can be tested. Hope this helps.
There are firmware upgrades on (some) receivers, call customer support for Denon, or an authorized service center. They can help you over the phone. If you need more help, post a comment and I can help you further.
Re seat the audio and HDMI board on your 804 and it will correct the issue. from the back its the HDMI is the TOP board on you left an the Processor is the vertical bord on the left running along the side of the receiver it connects to the main board, amp board, and HDMI board as well as the main panel via a wide ribbon cable. take the boars out and reseat it back in place. if you put a fan in side the unit it will help alot. these connector when they start going they get worse with heat keeit the unit cool. good luck
I have lost video as well. I am probably taking mine in to the shop. What is the source of video? Does it matter? What are the connections for those sources? Component? S-Video? Any pattern there... Wish I had more info for you.