Apple TV 4K not passing 4K Dolby Vision on Yamaha RX-V4A

Had a excellent response from Yamaha.

as expected I missed a setting on the TV. Because when the Apple TV is directly connected to the Sony it just works. But via the Receiver you have to force it on the TV end. My other setting where correct but here is what they said.

Dolby vision does work form an AppleTV 4K but, there are settings that you must do on the TV and on the RX-V4A end in order for this to work.

Apple TV > Yamaha RX-V4A > Sony A90J

On the Sony TV, 

Go to SETTINGS

WATCHING TV

EXTERNAL INPUTS

HDMI SIGNAL FORMAT

Under HDMI 3(eARC/ARC)

Set to ENHANCED FORMAT(Dolby Vision).

On the RX-V4A

SETUP

HDMI 

Settings as follows:

HDMI CONTROL - ON

4K UPSCALING - OFF

HDCP VERION - AUTO

HDMI FORMAT - MODE 1

On AppleTV 4K

Audio-Video settings

Set format to 4K Dolby Vision

And I will add again I tried both Mode 1 (High Bandwidth) for 422/420 4K 60fps Dolby and HDR 10+ signals and Mode 2 (regular bandwidth) for 422/420 4K 24fps Dolby and HDR 10+. All work directly to TV and do not when run via the Receiver. Only HD and 4K SDR signals work.

So a little update: Though I can make 4K 60fps Dolby Vision pass it does not persist past a reboot. To fix that issue I must set the eARC input on the Sony A90J from Dolby Vision back to standard then back to Vision for the picture from the Apple TV to make it to the screen.

I am not sure where the bottle neck or transaction error is occurring. Will have to reach out to Apple Support and Sony support to try and figure out a fix.

First step is to see if I can force Apple TV to Dolby Vision. I think the automatic detection is causing the problem.

Thanks for the reply. The Cables are Premium and like I noted above I had directly run from the Apple TV 4K to the Sony A90J and it works great. Adding in the receiver blocks the HDR.

I guess they don’t work weekends. Hopefully they will contact me some time this week. It appears the RX-V6 has the same issue. Up and beyond the 120Hz 4K issue for gaming consoles.

Ya have to keep the knowledge flowing. Thanks for being the only one to chime in. Cheers