Apple TV 4k HDMI handshake and Dolby Vision

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Level 1

4 points

Apple TV 4k HDMI handshake and Dolby Vision

I have an Apple TV 4K connected to a Denon receiver with a UltraHD certified HDMI cable and then connected to an LG CX OLED 65 also with a UltraHD certified HDMI cable.

a few months ago, I started having problems where powering up, the AppleTV would take up to 30 seconds to complete an HDMI HDR handshake so the screen would be blank for that time. Now it can take up to 60 seconds or it never displays any picture.

I replaced the HDMI cables and also tested on other devices like an UltraHD Blu-Ray player with HDR and there are no issues with that device. Picture and HDR display is instant with any other device except for Apple TV.

There is something wrong with the AppleTV. The only option is to restart it every single time, but it should not function like this. Even when I can get it to display it takes 30 seconds to do so!

Dolby Vision seems to be part of the problem.

Apple TV 4K (2nd generation)

Posted on Mar 24, 2023 01:12 PM

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Answer 1

bgmeek

Level 4

1,225 points

Mar 24, 2023 05:12 PM in response to ConsumerDan

As a troubleshooting experiment, what happens if you plug the ATV4K into the LG CX, and let the TV forward audio to your Denon via eARC? My theory is that the Denon is your bottleneck during initialization (assuming your theory that negotiating the availability of DolbyVision is correct).

I do understand that for the ATV4K's delivery of uncompressed Dolby Atmos audio bits, your current cabling method is optimal, and running more than one HDMI into your TV (when there's an AVR present for cable management) is a bummer.

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Apple TV 4k HDMI handshake and Dolby Vision

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