Seems like a possible workaround, but it isn't the question I asked. Hard to believe that all these receivers support 4k pass-through, but none of them work as intended with Comcast.
If I use an HDMI splitter, none of the receiver's on screen menus will be visible.
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Comcast was out to the house for the third time to try to figure out why 4k is not working properly from the xg1v4. Their conclusion was that the sound cannot be passed through the receiver (Onkyo TXNR646), despite it being within spec for all the equipment, using the correct ports, high quality cables, etc. Bypassing the receiver is not an option, because the display has no audio capability at all (it is a projector), and the xg1v4 has no separate audio output. In looking through this forum, others have had the same problem, so I think it would be useful to ask the question the other way around. Which audio receivers are confirmed to actually work well with 4k UHD passthough from the xg1v4?
I saw reference to one recent model Denon that was working well, but that's all. Anyone else have a receiver which successfully passes though 4k@60p UHD? What model is it?
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Pace XG2v2 STB Yamaha RX-V383 audio receiver Optoma HD33 projector Pace XiD-P STB
It is worth noting that all of these support HDCP 2.2.
If I plug the STB HDMI cable into the receiver, and the HDMI out from the receiver to the projector, the STB will crash as soon as I switch to that input. After that, when I switch away from that input, or turn off the receiver, the STB reboots. If I don't turn off the receiver or switch to a different input, the STB freezes indefinitely. If I let the STB reboot, it will crash again if I go back to that input. The behavior is the same on both of the STBs shown above.
If I bypass the receiver and plug the STB HDMI directly into the projector, it works fine. In that case, I need to connect an optical cable from the STB to the receiver, as the projector has no sound.
If I pass the HDMI from the STB through the receiver to an older projector (720p, no HDCP 2.2), it works fine. If I pass the HDMI from a different source (e.g. Chromecast, or my Dell laptop) through the receiver to the Optoma projector, it works fine. When I had an older STB it worked fine, but back then I was passing it through a different audio receiver.
I tried switching to different HDMI inputs on the receiver, different HDMI input on the projector, using different HDMI cables, and it made no difference.
I tried one really complicated experiment to figure out as much as I could. I connected the HDMI from the STB into the receiver, being careful not to switch the receiver to that input. I also ran a yellow composite video output from the STB to the projector, and switched the projector to that input. I also ran an optical cable from the STB to the receiver. So then I could see the TV picture on the screen, but it was low quality through the yellow composite video. I could hear the sound through the optical output into the receiver. I brought up the STB menu using the remote, and I could see the box was responding normally and showing the TV channel behind the menu. So far so good. Then I switched the receiver to the HDMI input from the STB, and it was still good. I was getting the audio from HDMI, but still showing the video from the composite input on the screen.
Then I changed the projector input from composite to HDMI, and everything died. Both the sound and the video cut out immediately. I gave it a good amount of time to handshake the HDMI, but nothing. I switched the projector back to composite video input, and saw the STB was frozen. I could see the menus, and the TV picture was still actively running behind the menu. But the menus no longer responded to input from the remote, so it was clear the software had crashed. Then I switched the receiver back to the optical input to see if there was any sound, but that immediately triggerred the STB to reboot. It rebooted cleanly, but then when I again tried to switch to HDMI the same thing happened.
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