I’m totally stumped. I have an Epson 4040 projector, which is capable of handling 4K HDR up to 30hz. It works fine with my Apple TV displaying both 4K and 4K HDR. When I connect my Odroid N2 running fresh installs of CoreELEC, both 9.2.7 and Matrix RC2, I get no picture when playing 23.976 content. If I play 1080p with HDR, it outputs as expected. If I play 4K at 23.976hz the screen is black. If I Whitelist 4K with higher refresh rates only, then it outputs picture but the refresh is wrong at 30-50hz. I’m totally stumped. I’ve tried every combination of Whitelisting I can think, but the moment I enable 4K 23.976hz, I get a black screen…
1.- One thing is the original resolution of the multimedia source and another thing is the display resolution, and THEY DO NOT NEED TO MATCH.
2.- Your EPSON 4040 Projector has a native resolution of 1080p, this means that any other resolution that is sent to the projector will be automatically converted to 1080p.
3.- Perhaps the HDMI cables you are using are not suitable for a 4K output resolution.
With these data you shouldn’t have a problem seeing anything. Set the output of your Odroid N2 to 1920x1080p50Hz or 1920x1080p60Hz, regardless of the resolution of the media source.
Weird product:
“which accepts 4K UHD content and upscales non-4K content”
What’s the benefit if there is a downscaler behind (which marketing doesn’t tell you explicit) to match native resolution? 
It’s possible that your HDMI cable cannot pass the required bandwidth, and it’s also possible that the projector doesn’t like 4:4:4 chroma input with a 4K24P.
Try to enable the Force 4:2:2 chroma toggle and reboot. See if that helps.
Didn’t fix it. I gave up and bought a JVC NX7. Problem solved
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