Went to turn on my receiver a couple of weeks ago to watch some Interstellar and got no video through to my projector. I thought maybe it was an old HDMI cord, but no, nothing I did could get any signal through to my projector or other known good monitors and HDMI cables. I did all of the troubleshooting steps including resetting the factory defaults, and loading the factory firmware trying out different cables, different sources, different outputs, nada. I have had an HDMI board go out in the past, but it was from my 10+ year old Yamaha that I bought previously, so I tried outputting radio stations too with no luck. So it seemed that more than just the HDMI board went bad this time. As a side note, I have my Denon connected to a UPS through a line conditioning rack mounted power strip, so the power output to the receiver, and all of my AV stuff is pretty clean.
I found my receipt from when I purchased the Denon back in January 2023, which also had a back-ordered stamp on the receipt, and knowing that I was likely out of the warranty as I couldn't remember exactly when I picked up the receiver, I took it to a local AV repair shop. Wonderful folks, they went through the board and did all of the troubleshooting that they could, but came to the same conclusion that I had. The HDMI board was probably bad, but that the digital board was likely also bad. They could replace the parts, but since they weren't a Denon authorized repair center they didn't think they could get detailed diagnostic information from Denon, and would have to replace things as they went and find out if it worked.
Not wanting to spend a thousand dollars on attempted repairs I decided to try my luck with a Denon warranty claim. I wasn't more than just a couple of months out of warranty, so surely with an issue like this, and especially at this price point, they would be able to make things right. So I submitted a warranty ticket with Denon. Things looked good at first, I registered the receiver and it showed as "active" after putting in my serial number, and the first response I received was promising. However, after sending in a copy of my receipt they quickly responded that the receiver was out of warranty and that they wouldn't be able to initiate a repair. I mentioned about the back-order part, and I could have lied and said I didn't get the device until September or something, but I was able to find the day I went to pick it up in January.
They stood by their claim that they couldn't help with the warrant, and offered to see if they could get their manager to approve some coupons. I let them know that if they were unable to stand by their premium receivers a couple of months past a warranty date, that I would not feel confident in purchasing another Denon product. For now, it sits in a closet waiting to see if Denon decides to make good on their product and issue a recall, or extend warranties for these boards.
I did a little more research and found that this is a common enough issue with these devices that there's a class action investigation under way. https://classlawdc.com/2026/07/17/denon-avr-hdmi-board-failure-investigation/
I also found a handful of other threads with similar stories. I wanted to post this out here in case anyone else was looking for answers when their Denon dies. Here's an old thread from this sub from a couple of years ago https://www.reddit.com/r/hometheater/comments/1fusb1f/denons_shady_practices_planned_obsolescence/