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DukeOfHavoc
Contributor I
May 23, 2023

Arc no longer playing TV audio LG OLED55CX6LA

Hello

As per the title, I have a LG OLED and Arc. I’ve spent 2 hours tonight trying to figure out why all of a sudden I cannot get any TV audio to play. It works perfectly for music as part of a larger network or on its own. 

 

List of what I’ve tried (in no particular order)

Full factory reset of TV

Updated TV to latest firmware (04.40.70)

Full factory reset of Arc.

Updated Sonos App (15.4)

Updated firmware for all speakers (15.4)

Re-run the TV set up for Arc via the app.

Uplugged the TV and Arc for 15 minutes.

Tried resetting the HDMI handshake by disconnecting and leaving them for 15 minutes.

Tried a different HDMI cable that I know works with other devices (I’ve always used the Sonos one).

Used Sonos’ recommended audio settings on the TV:

TV settings:

DTV Audio Setting: Auto

Digital Sound Out: Pass Through

eArc: On.

 

 

The TV can see the speaker. It displays that the Sonos is connected and that I can control it via LG’s universal remote option which had always worked prior. I even get Sonos’ pretty wallpaper if I select HDMI2 (which is the eARC port) on the screen.

 

When I flick eArc from off to on, I get about 5 second of audio before it cuts out. The audio works perfectly via the internal speakers.


I have submitted a diagnostic report: 663870006.

Please can someone help?

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14 replies

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Ken_Griffiths
Ken_Griffiths
May 31, 2023

@DukeOfHavoc,

I’ve seen this issue reported before with this make/model of TV and it turned out to be an Amazon Fire TV stick connected to one of the HDMI ports stealing CEC focus. Is there anything else connected to the (other) HDMI ports 1, 3 or 4? If so, remove those temporarily and see if that makes a difference. 

DukeOfHavocAuthor
Contributor I
May 31, 2023

@DukeOfHavoc,

I’ve seen this issue reported before with this make/model of TV and it turned out to be an Amazon Fire TV stick connected to one of the HDMI ports stealing CEC focus. Is there anything else connected to the (other) HDMI ports 1, 3 or 4? If so, remove those temporarily and see if that makes a difference. 

Hiya, Ken.

Thanks for the comment. Up until last week, I always had my PS4 plugged in but since this issue, I’ve not had anything else plugged in. 

It lasted around 2 hours tonight before the sound just decided to stop working. Nothing changes on screen, the TV can still see the Arc, it just stops transmitting sound. 

Ken_Griffiths
Ken_Griffiths
May 31, 2023

Hiya, Ken.

Thanks for the comment. Up until last week, I always had my PS4 plugged in but since this issue, I’ve not had anything else plugged in. 

It lasted around 2 hours tonight before the sound just decided to stop working. Nothing changes on screen, the TV can still see the Arc, it just stops transmitting sound. 

It certainly sounds like a HDMI CEC issue, but whether it’s the TV, HDMI cable(s), or Sonos Arc hardware/software that’s faulty here, is difficult to say at the moment. I see you have tried a full TV reset. have changed the HDMI cable and that you tried a factory reset of the Arc too?

My own thoughts are it really would be helpful to try the Arc with another TV, as that might help point the finger in a particular direction, or you might want to consider the factory reset(s) again.. but I know what a PITA that is to do.

    desert cardinal
    Lyricist I
    July 9, 2023

    Had the exact same problem described on my LG OLED after a TV firmware update.  Easy solution for me..eARC somehow got turned off.  Go to sound settings (it will say you can’t use them with HDMI ARC on) and scroll to bottom.  eARC needs to be selected and the ARC immediately works as always.

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