T
The Daily Insight

How to fix Denon AVR 791 HDMI port?

Author

John Thompson

Published Apr 26, 2026

How to fix Denon AVR 791 HDMI port?

“I’m a Denon AVR 791, nice to make your acquaintance.” Turn everything off. Disconnect the HDMI. Unplug everything from the wall. (must be done in this order) In about an hour, re-connect all the HDMI FIRST. Plug the receiver into the wall…then plug everything else back into the wall.

What is the HDMI port on Denon av7704?

On the AV7704 the only HDMI port used is port 3 that is labeled Blu-Ray by default. This isn’t a complex system. 3) Hitting CBL/SAT on the AV7704 remote returns from the OPPO to the signal originating from the TV with ARC used for audio.

Why is my Denon AV receiver not working?

What this means is that these receivers cannot pass through 4K at 120Hz or 8K at 60Hz when attached to sources outputting these ultra high video resolutions, resulting in a blank screen on the receiving TV/monitor.

How do you turn on HDMI on Denon arc?

Note: To use ARC you must turn on HDMI control in the menu of the receiver, as well as the TV. The TV must also have the correct settings to enable audio to be output to the receiver. To turn on HDMI control in the receiver press the SETUP button on the remote, select VIDEO, then HDMI Setup.

On the AV7704 the only HDMI port used is port 3 that is labeled Blu-Ray by default. This isn’t a complex system. 3) Hitting CBL/SAT on the AV7704 remote returns from the OPPO to the signal originating from the TV with ARC used for audio.

“I’m a Denon AVR 791, nice to make your acquaintance.” Turn everything off. Disconnect the HDMI. Unplug everything from the wall. (must be done in this order) In about an hour, re-connect all the HDMI FIRST. Plug the receiver into the wall…then plug everything else back into the wall.

What this means is that these receivers cannot pass through 4K at 120Hz or 8K at 60Hz when attached to sources outputting these ultra high video resolutions, resulting in a blank screen on the receiving TV/monitor.

What should I do if my Denon arc is not working?

I reset the Denon and reset the TV. It didn’t help. 2. Procedure using a HDMI cable Connect the HDMI cable from the ARC HDMI input connector on your TV to the ARC HDMI out (Monitor) connector on your AV receiver. Select “TV AUDIO” from the input source select buttons on the remote control or the receiver.

Can a Denon AVR x2400h connect to a TV?

Tried the second HDMI out on the amp to no avail. Optical out from the TV to the amp works but not ideal as the volume cannot be controlled via the TV or Sky remotes. The digital audio output (speaker) settins on your TV would be either TV, optical or HDMI ARC.

Is there an optical arc option on Denon?

THhere’s not an option that encompasses and includes bothoptical and HDMI ARC under a single heading.. Select the HDMI ARC option and not the optical option.

Tried the second HDMI out on the amp to no avail. Optical out from the TV to the amp works but not ideal as the volume cannot be controlled via the TV or Sky remotes. The digital audio output (speaker) settins on your TV would be either TV, optical or HDMI ARC.

THhere’s not an option that encompasses and includes bothoptical and HDMI ARC under a single heading.. Select the HDMI ARC option and not the optical option.

How does HDMI diagnostics work on an AV receiver?

3When starting the HDMI DIAGNOSTICS mode, the AV Receiver will automatically start the Hardware Self Diagnostics Test to check whether hardware failure occurs. If there are no errors, the AV Receiver will show the HDMI Diagnostics menu on the front panel display.

How to get into HDMI diagnostics mode?

0HDMI DIAGNOSTICS mode cannot be entered from the Setup Menu or Setup Assistant. Close the menu first. 3When starting the HDMI DIAGNOSTICS mode, the AV Receiver will automatically start the Hardware Self Diagnostics Test to check whether hardware failure occurs.

What should I do if my HDMI port is not working?

In about an hour, re-connect all the HDMI FIRST. Plug the receiver into the wall…then plug everything else back into the wall. Turn on the receiver first…then you can turn everything back on. That will re-establish the handshake. *by the way, BD players are most notorious for wonky handshake.

Why does my Denon AVR not work on my TV?

If you have Dolby Digital set to ON on the cable box, but your TV cannot accept Dolby Digital audio (many cannot), there will be no audio passed to the TV, rather you would have to set Dolby Digital to OFF on the cable box. Also, for more helpful information on your new AVR, review posts 3-7 in the 2015 Denon AVR Owner’s thread linked below

Why is my Denon HDMI audio passthrough not working?

Audio passthrough doesn’t work when the avr is in standby mode. If you have Dolby Digital set to ON on the cable box, but your TV cannot accept Dolby Digital audio (many cannot), there will be no audio passed to the TV, rather you would have to set Dolby Digital to OFF on the cable box.

Note: To use ARC you must turn on HDMI control in the menu of the receiver, as well as the TV. The TV must also have the correct settings to enable audio to be output to the receiver. To turn on HDMI control in the receiver press the SETUP button on the remote, select VIDEO, then HDMI Setup.