AVS Forum Special Member
Join Date: Aug 2002
Location: Toronto area, Canada
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^ I suppose you've done "complete" resets on the affected AVRs? Though it seems unlikely that all three units would "need" resets, I've never reset my X4000 nor any other Denon (3808, 4310) in the last 5-6 years.
You do understand that basic troubleshooting of multiple problems in a "system" always starts with looking at the common items. In this case that includes everything in/about your HT system except the AVRs. That is why we said what we said. This is far more likely, probably by a couple orders of magnitude, than that you happened to get the same defective HDMI (say, i.e. the "brain") boards that were almost certainly made totally separately in time and space from your AVRs. Never mind the vagaries of shipping and stocking on the way to your hands.
A little easier to see the same hardware defect for the two X4000s presumably from the same dealer. My dealer trusts my opinion of stuff, so when I said I thought the X4000 was a good deal for what it did, he decided to stock them and ordered some extras besides mine. They all came from the same place at the same time and I saw their S/Ns were nowhere near each other, nor were the build dates the same. (I wanted to choose the newest date code, that's why I looked.) Just saying, so check your build date codes, I forget how now but it's easy and in the relevant threads here. Still doesn't account for the HDMI boards being made totally separately though.
That said, it could happen, and I hope I never have such bad luck, for that's what it would be. And you're "on the ground", it's almost impossible to troubleshoot anything probably hardware-related, except user/connection problems and other simple stuff, over the web. Maybe once you find the date codes you can ask around here, see if others had probs with the same codes.