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Sonos Arc, Apple TV 4K and eARC setting on LG OLED C3

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I just bought a new Sonos Arc and LG 65OLED65AUA tv. Everything seems OK but I am having problems with sound from my Apple TV 4K (latest version). I only get sound when Dolby Atmos content is played, no sound with Dolby 5.1, HD, etc. I spent and hour with Sonos phone support yesterday. We were unable to find a solution. I tried different settings on the Apple TV and LG tv. Today I turned off the eARC setting on the LG tv and now all is working. I think with eARC there is more information transferred with ARC and there might be a slight difference in sound with Dolby Atmos. The eARC was turned on automatically when I installed the Sonos Arc on the LG tv. Just curious why the eARC setting seems to fix the problem. Thanks.

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GuitarSuperstarAnswer

Lead Maestro

Set the TV to these settings:

HDMI Input Audio Format: Bitstream

Digital Sound Output: Pass Through

eARC Support: On

Set the Apple TV audio settings to this:

Change Format: Off

Dolby Atmos: On

Then do this:

Disconnect everything from the TV and unplug the Arc, Apple TV, and TV from power for a couple of minutes. Plug everything back in but keep everything disconnected. Make sure Simplink is enabled in the TV settings. Run TV Setup in the Sonos app and follow the app instructions. When the app instructs you, connect the Arc to the TV’s HDMI eARC port using the Sonos-supplied HDMI cable. After the Arc has been successfully connected, connect the Apple TV to the TV.

"Receive with simplicity everything that happens to you." - Rashi

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Ken_Griffiths

Maybe try swapping their connection to the LG TV and have the Fire TV connected to the current Apple TV HDMI input and vice versa - set things up again in the WebOS ‘Device Connector’, or whatever LG calls that these days and perhaps see what happens in that case.

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gianvito.morena

Lyricist II

Maybe try swapping their connection to the LG TV and have the Fire TV connected to the current Apple TV HDMI input and vice versa - set things up again in the WebOS ‘Device Connector’, or whatever LG calls that these days and perhaps see what happens in that case.

I tried also that. Still no success 😔

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billp0527

Lyricist I

Apple TV 4K 3rd generation, FIOS TV One STB, and LG C3 I lose sound.

If I connect an Apple TV 4K 2nd generation everything works fine. Makes no sense, both Apple TV 4K’s on tvOS 17.

CEC off on all devices, using Harmony Remote

Haven’t seen a way to completely power down the FIOS STB, only goes to standby.,

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rmartin7Author

An update. About two weeks ago I got a response from LG. At first they were going to set up a home service appointment. They cancelled that and said I should report it as a software problem and gave me a generic link to where people report a wishlist for future features. No help at all. I mentioned Apple support thought the problem was with the Sonos Arc. Last Thursday Sonos support spent about 2 hours on the phone collecting log files in different situations and sent them to one of their engineers. This is the response I got from Sonos:

“... thank you for all the information provided.

Furthermore, I have spoken with one of our engineers and he mentioned there were no reports about this issue until we got yours. Then, checking on all the symptoms, we concluded that it could be related to the incoming CEC or the board on the TV itself not working properly.

I understand this can be an answer that you did not expect, however, it seems to be out of our settings since the Arc is reading the information from the device to which it is connected. In this case, I can recommend some other steps that may help you with this matter:

Try different HDMI ports on the TV to connect Apple TV.
Check different audio formats on the TV itself, for example, PCM.
Also, check different audio formats besides Atmos on the Apple TV.

If you have any issues with scheduling or other questions, feel free to reply to this email or give us a call at 1-800-680-2345.”

So now I am back to using my Apple TV 4K 2nd generation and waiting for some sort of update from either Sonos, LG, or Apple or maybe a 4th generation Apple TV.

I really like the way Apple TV works as far as navigation and features so the 2nd generation is the best option for me. There probably is something with how CEC works with all of the device since having only the Apple TV and Sonos Arc connected works. At least on my set up if eARC is enabled I can switch the CEC off on the LG but it immediately switches back on.

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rmartin7Author

Latest update. LG sent a local technician out. He said there were no error codes showing on the LG TV when I was having the sound problem. I can reproduce the problem. With only the Apple TV and the Sonos Arc attached the Apple TV 3rd generation works fine. Adding a third device causes the problem and unplugging the third device brings the sound back. The technician didn't recommend replacing a circuit board since he couldn't find a problem. He recommended I trade in the Sonos Arc and get another brand of soundbar. I am back using the Apple TV 2nd generation and I can have all of the HDMI ports connected. I still have 2 weeks to return the LG TV to Costco. I considered switching to a Sony but I really like the LG TV except for this problem and I am not sure that switching the TV would solve the issue.

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