LG NANO90 & Apple TV 4K 2021 tvOS 15 - Can't play Atmos

[shasoosh]

Any one here owns this TV and an Apple TV 4K 2021 on tvOS 15, using the internal speakers and can confirm he is getting Dolby Atmos?
Playing Netflix content will only pop the Dolby Vision popup.
Atmos is turned on in the TV settings.
eARC = disabled
HDMI audio input = bitstream
Digital sound output = auto

Moving the Apple TV & HDMI cable to another room and connecting it to a LG CX plays Atmos just fine which eliminates Apple or cable issue.

webOS apps play Atmos without a problem.

Model: 75NANO90VNA
Firmware Version: 03.23.35

 

[NARadyk]

Yup. I have this exact issue as well.

Have had it for months without a resolution for it. (I have a different LG tv though).

 

[-Gonzo-]

Not sure if this is your issue but ATV4K doesn’t do Bitstream, it sends Atmos over LCPM.

 

[shasoosh]

Yup. I have this exact issue as well.

Have had it for months without a resolution for it. (I have a different LG tv though).

What TV do you have? Did it work at some point?

Not sure if this is your issue but ATV4K doesn’t do Bitstream, it sends Atmos over LCPM.

I've tried changing the output to PCM, still no luck.

 

[shasoosh]

Anyone?

 

[priitv8]

Anyone?

Check if your tv supports Dolby MAT. That is what aTV outputs (Atmos over PCM 7.1).

 

[Sweetfeld28]

I have this and have both working... Atmos and Vision. but I'm not using an AppleTV with the TV.... just using the Apple TV app on the LG webOS... and it works.

 

[shasoosh]

I have this and have both working... Atmos and Vision. but I'm not using an AppleTV with the TV.... just using the Apple TV app on the LG webOS... and it works.

Atmos always works for me with internal apps. My problem is with apps on the Apple TV device.

 

[priitv8]

Anyone?

Weird that you have not gotten any responses on other places.
your problem #1 is that appleTV does NOT output Dolby Atmos bitstream.
Try to understand if your LG can handle the decoded format (Dolby MAT) of Atmos that appleTV sends on HDMI.
All Atmos AVRs and soundbars can. Not sure about TVs though.

 

[Sweetfeld28]

Is your Apple TV plugged into the ARC/eARC port [audio return channel]? Try turning on your listed eARC, and see if that resolves your issue. On my other Samsung TV, I do have an Apple TV 4K connected to it and it works without issue; I have it connected to the ARC port.

 

[shasoosh]

Weird that you have not gotten any responses on other places.
your problem #1 is that appleTV does NOT output Dolby Atmos bitstream.
Try to understand if your LG can handle the decoded format (Dolby MAT) of Atmos that appleTV sends on HDMI.
All Atmos AVRs and soundbars can. Not sure about TVs though.

Thanks. How can I understand that? Tried to look at the specs of the TV but there is nothing about Dolby Mat. Google didn't help either. I've also tried to look in the LG CX OLED specs, it didn't say anything about Dolby Mat either but the TV fully supports Atmos via the Apple TV.

Is your Apple TV plugged into the ARC/eARC port [audio return channel]? Try turning on your listed eARC, and see if that resolves your issue. On my other Samsung TV, I do have an Apple TV 4K connected to it and it works without issue; I have it connected to the ARC port.

Thanks. To my understanding, ARC or eARC is the audio return channel, meaning that the apple TV should be connected to another HDMI port while the eARC port should be connected to a soundbar or something of that sort in order to pass the audio from the TV. That's not the case here.
I want to use the TV speakers so I'm not sure why I need to turn eARC on.

Regardless, it is connected to the eARC port and I've tried turning eARC on on the TV but there was no sound.