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

R
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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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Best answer by GuitarSuperstar 6 August 2023, 05:56

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70 replies

R
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Are you talking about the privacy settings on the Apple TV?  Which setting, do you switch it off and then back on?

J
Userlevel 2
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LG settings

Support; Privacy & Terms; User Agreements 

R
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Thanks.  That worked.  Not sure that I will use it but interesting.

J
Userlevel 2
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It’s the only way currently to maintain the proper settings on the LG for best sound. 

R
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I think I have solved the problem.  These are my current settings:

Apple TV 4K 3rd generation, 128 GB, ethernet

    Video and Audio
        Format 4K SDR
        HDMI Output YCbCr
        Chroma 4:4:4
        Match Content
            Match Dynamic Range On
            Match Frame Rate On
            Quick Media Switching On
        Audio Output Receiver Speakers
        Audio Format
            Change Format Off
            Dolby Atmos On
        Audio Mode Auto
        Color Balance Balanced (with Enable Dolby Vision not selected, I 
            used the    color balance calibration with my iPhone.  With Dolby Vision enabled this is not an    option.)

LG 65OLEDC3AUA

    General
        External Devices
            HDMI Settings
                4:4:4 Pass Through On
                Quick Media Switching On
                HDMI Deep Color 4K
                SIMPLINK (HDMI-CEC) On
        Sound
            Sound Out HDMI(ARC) Device
            Advanced Settings
                Select HDMI Input Audio Format  Bitstream
                Digital Sound Output Pass Through
                eARC Support On

 

I am not sure why this works or if these setting affect other areas with video or audio.  Let me know what you think.

R
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I thought everything was OK but it wasn’t.  I can switch HDMI inputs without problem but if I switch to one of the WebOS apps like LG Channels the problem recurs.  If I unplug the TV and plug it in again the problem resolves until the next time I use WebOs apps.  

J
Userlevel 2
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Looks like you turned off Dolby Vision as a format well. 

R
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From what I understand choosing 4K SDR only applies to the home screen.  So long as match content and match frame rate are on, switching  to Dolby Atmos content puts the Apple TV in Dolby  Atmos.  That seems to be my experience.  

I am not sure why I have problems using the WebOs apps.

J
Userlevel 2
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I don’t use LG apps ever. The apps on the Apple TV are far superior to my experience. 

R
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I am having the same issues again so I do not have a solution.  I am back to using my Apple TV 4K 2nd generation.

B

Try disabling 4:4:4 pass through, that setting shouldn’t be used for the Apple TV. It’s for PC/Consoles.

like I said I have zero issues on both a C9 and G3 so no idea why you’re having so many problems.

R
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When I had everything working I tried disabling the 4:4:4 pass through just to see if I could and the problem recurred.  At least with those settings I could get it to work for a while.

J
Userlevel 2
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After six months… LG is finally refunding me the entire purchase price of my G2. 

R
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Wow.  I am not sure a different TV would solve my problem.  All of my devices work fine except for the Apple TV 4K 3rd generation.  I think the problem lies there.  It’s good to know LG would provide that level of support.  Thanks for the reply.

J
Userlevel 2
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I have the same exact problem as you. The problem lies between the LG, the Apple TV, the Sonos Arc.  I will likely attempt buying the G3. If that doesn’t work, I’ll return it and buy the Sony A95L. 

J
Userlevel 2
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If that fails… i’ll dump the Sonos Arc and start fresh.  Life is too short for this kinda trouble!

J
Userlevel 2
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by the way, and just to be clear, LG support service was the worst I’ve ever experienced. Absolutely horrible. It took six months to find a resolution with their support department. The only reason I was successful is I was willing to spend hours and months pressuring them for a resolution. I’m gnarly like that, beyond what most healthy humans would tolerate :)

R
Badge +2

I updated the Apple TV 4K 3rd generation to tvOS 17.0 today.  That had no effect.  Back to using Apple TV 4K 2nd generation. 

R
Badge +2

Is there a way for an author of a question in Sonos Community to remove the “best answer” label?  Initially I thought the problem was solved but it turned out it wasn’t?

Also just a comment.  I would think the Sonos Arc, LG OLED C3 and Apple TV 4K 3rd generation are popular products.  I have only found one or two discussion about similar  problems that I am having with eARC and Dolby Atmos sound and I have searched many websites.  Am I one of the few that has this problem?  I could see many people having this particular combination of products not just me because of their popularity.  Seems weird.

Airgetlam

Not for the author, no, it requires a forum moderator. However, it does seem that the vast majority, at least from what I can see, ignore that ‘function’ completely, likely for that very reason. 

Bruce

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