Skip to main content
contractcooker
Contributor I
December 19, 2020

eARC problems with LG CX (Beam and Arc)

I have a Sonos Beam and Sonos arc. Both sound bars will intermittently drop audio when connected to an LG CX Oled TV via HDMI/eARC. When I plug in via the optical to HDMI adapter the drops go away (but I lose Atmos and the ability to control the soundbar with the TV remote). It seems to me that the problem lies either with Sonos’ or LG’s implementation of the e-arc/arc protocol. This is incredibly frustrating. I just want my new TV and new soundbar to play nice.

    This topic has been closed for further comments. You can use the search bar to find a similar topic, or create a new one by clicking Create Topic at the top of the page.

    28 replies

    Show previous replies
    QuiXilver
    Lyricist III
    August 19, 2021

    I made a mistake in my last post, the ARC does discount from the SUB and ONE SL’s when the TV is turned on and it’s using the optical port.  It just needs to set overnight with the TV off and when the TV is turned on it disconnects from the SUB and ONE SL’s.  The ARC continues to work otherwise and when the TV is turned off it reconnects to the SUB and ONE SL’s.  I can also get it to reconnect by power cycling all the SONOS components.  I’m using the IOS Sonos APP to monitor the ARC.  I’ve tried wired and wireless modes, it’s not an RF interference problem because I can get the system working by cycling power on all the SONOS components after the TV is on. Once it’s working it stays up until the TV is turned off for a couple hours and then turned back on.  Everything is pointing to a firmware bug in the SONOS components.

    Is there a way to back up the firmware version on the SONOS components?

     

    I meant to ask you - have you tried removing the sub from your setup and leaving the sl’s and arc connected? Then connect the sub and remove the sl’s. Does it behave the same in these scenarios? I'm wondering if one of them are causing the issue.

     

    mchorn64
    Trending Lyricist I
    August 19, 2021

    I have a better understanding of the problem, it has nothing to do with the LG CX.  I have the same issues when the ARC is connected directly to the BD player.  The only thing that seams to work is to wire all the componets together on an ethernet switch.  This is a Sonos ARC problem.  I’m going to repost to a Sonos ARC problem stream sense this is not an issue with the LG CX

    QuiXilver
    Lyricist III
    August 19, 2021

     

    I have a better understanding of the problem, it has nothing to do with the LG CX.  I have the same issues when the ARC is connected directly to the BD player.  The only thing that seams to work is to wire all the componets together on an ethernet switch.  This is a Sonos ARC problem.  I’m going to repost to a Sonos ARC problem stream sense this is not an issue with the LG CX

    Wait. When you said you tried connecting them on ethernet before, what were you connecting them to? 

    mchorn64
    Trending Lyricist I
    August 22, 2021

    I wired all the Sonos components together on the same ethernet switch the problem went away.  They only fail if the Sub and Surrounds are wireless, the ARC can be wired or Wireless and the system still fails.  I moved all the Sonos components away from everything else (12 feet) and it still failed when the audio stream was started (HDMI_ARC or Internet).  But after talking to support Friday, giving up and going to sleep (with the system still failing), the system started working Sat and has not failed sense.  So I’m in a holding pattern on this issue now, can’t fix something that’s working.  I put the components back together in the theater room and watched a movie last night, it worked great and sounded great.  Keeping my fingers crossed.  

      JSnids
      Lyricist I
      October 17, 2021

      Same issue.  I have a new LG 87” connected to my Arc via the eARC HDMI port utilizing an expensive high bandwidth return cable.  My system is connected to a Sonos sub and 2 Sonos One wirelessly.  My audio drops daily, whether I’m on cable (Xfinity) or AppleTV.  Always requires a reset.  Not good for a $2k+ system.

      GuitarSuperstar
      Lead Maestro
      October 17, 2021

      Same issue.  I have a new LG 87” connected to my Arc via the eARC HDMI port utilizing an expensive high bandwidth return cable.  My system is connected to a Sonos sub and 2 Sonos One wirelessly.  My audio drops daily, whether I’m on cable (Xfinity) or AppleTV.  Always requires a reset.  Not good for a $2k+ system.

      If you disconnect the Xfinity box, do you still experience audio drops from the Apple TV?

      "Receive with simplicity everything that happens to you." - Rashi
      JSnids
      Lyricist I
      October 17, 2021

      Yep.  It also drops from Internet streaming content, resulting in blaring audio from the TV built-in speakers, which then can’t be controlled.  Thanks for your reply.

      mchorn64
      Trending Lyricist I
      October 17, 2021

      My Sonos system has broke again.  My ARC will not connect to the sub or surrounds even if I reset everything and reinstall the entire system now.  I’ve wasted 8+ hours between Sonos support and the dealer so I’m returning the components to the dealer on Tue.  

      Terms & ConditionsAccessibility statement