Issues with resolution Apple TV 4K after TVOS update 14.5

Since I've ungrade my ATV to 14.5 I have had issues with the resolution. It won't appear now through my AV reciever. I've had to use it in another TV and changed it to 576p. I tried this in my reciever but when I try to change back my screen goes black. It was working perfectly before this update. Also the ATV is now stuck on 576p and when I try to change it to any other resolution it gives me an error and stays on 576p. What a nightmare.

Posted on Apr 29, 2021 10:38 AM

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Midnight Cuts

Level 1

4 points

Posted on May 24, 2021 12:20 PM

I was running Apple TV 4k connected to Denon AVR and Sony A8H. I was having the same issue, running tvOS 14.5. Switched to 576p SD and then got stuck there. Unable to change to any other video resolution, even basic 1080 p60 SDR. Tried everything on the Apple TV; rebooted several times, reset video settings, removed AC power and HDMI cable for 20 seconds from back of Apple TV.

Finally solved the issue! Updated software to tvOS 14.6, tried to change video resolution but that did not work. However, when i engaged the “Enable Dolby Vision” button, it went into it usual 25 second test mode and i did get a 4k Dolby Vision signal. I clicked accept/continue button (the top choice - sorry can’t recall the exact word for “yes, i can see the Dolby Vision test screen”) and all was well. Apple TV 4k was back to normal, able to output all flavours of 1080p, 4k SDR and 4K HDR. Bottom line is the Enable Dolby Vision seems to have broken the logic loop and restore normal functions. (tvOS 14.6)

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Issues with resolution Apple TV 4K after TVOS update 14.5

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