Hi all. I had an LGOLEDB9 with my Arc connected and all was good. I upgraded to an LGOLEDG4 and for the life of me I can’t get it to connect to my Arc. I have tried everything suggested on here. Such as removing all other hdmi inputs and powercycling both the tv and the Arc. Tried different hdmi cables. Reset the arc & tv back to factory settings. And still no joy. Tv setup fails to recognise that the hdmi cable is connected. Even tried the optical adapter! Anyone got anything else I could try?? I should also say I’ve had a 2 hr support call with Sonos too.
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I’d probably call LG support. It seems as though the CEC system isn’t on/recognizing connected devices.
Did you look in the LG sound menu to see if HDMI is selected as the output?
I’d probably call LG support. It seems as though the CEC system isn’t on/recognizing connected devices.
Spoke to LG support this evening and they said that since the HDMI earc port ie recognising other devices the issue lies with Sonos. Dunno what to do now 
Curious to what Sonos support said. Beyond my and
Pull the power on the TV from the outlet, let sit for 2 minutes. Then plug it back in. This will force an HDMI handshake.
Curious to what Sonos support said. Beyond my and
They said to get in touch with the manufacturer as the arc still works on my older lgoled. Just ordered a new Sonos HDMI cable as misplaced the original but been using high end cables
Pull the power on the TV from the outlet, let sit for 2 minutes. Then plug it back in. This will force an HDMI handshake.
Tried this multiple times with no luck 
Did you look in the LG sound menu to see if HDMI is selected as the output?
One of the 1st things I did
Try this leave the arc and tv connected via HDMI. Make sure both devices are powered on. Unplug the TV from electrical outlet. Wait 30 to 60 seconds and plugin the TV back into power. See if that allows the Arc to be recognized.
I have an inherent (seemingly) mistrust of ‘high end’ HDMI cables, particularly, at least in my experience, as they rarely identify which ‘version’ of HDMI they are. For eARC to work, they certainly need to be a later spec, even high speed ‘older’ cables won’t carry the signal. Do yours identify which version of HDMI they are? Most often, I’ve found it printed on the cable itself, or in the original packaging, which I rarely keep.
I have an inherent (seemingly) mistrust of ‘high end’ HDMI cables, particularly, at least in my experience, as they rarely identify which ‘version’ of HDMI they are. For eARC to work, they certainly need to be a later spec, even high speed ‘older’ cables won’t carry the signal. Do yours identify which version of HDMI they are? Most often, I’ve found it printed on the cable itself, or in the original packaging, which I rarely keep.
It’s this https://amzn.eu/d/5SgifiO
Bleh, now I need to change my account back to the US.
But that cable looks fine to me, unless there’s a specific issue with ‘your’ cable, due to a manufacturing error. So, it’s less likely to be the cause of this problem you’re experiencing.
Curious to what Sonos support said. Beyond my and
They said to get in touch with the manufacturer as the arc still works on my older lgoled. Just ordered a new Sonos HDMI cable as misplaced the original but been using high end cables
Update. Official Sonos HDMI cable makes no difference
Bleh, now I need to change my account back to the US.
But that cable looks fine to me, unless there’s a specific issue with ‘your’ cable, due to a manufacturing error. So, it’s less likely to be the cause of this problem you’re experiencing.
Cable worked fine with the old tv. Now had 2 different new sets from LG and experiencing the same issue with both
Given the lack of other people posting about this, it feels like a local issue, although I’m not there to be sure. Neither of my Arcs are having any issue, they are connected to a Samsung and LG device’s eARC. I updated both yesterday morning to the latest firmware, neither are showing any issues. But I don’t have that specific model of LG, so I suspect the firmware on the TV is different for both of us.
Given than mine is running fine, my suspicion is that the issue isn’t with Sonos, and instead the settings or firmware on your TV. There have been several good suggestions, IMHO, from forum members, but we’re just the public, and don’t have access to any hard data, only what you’ve posted. I can only recommend that further discussion with either LG’s support (they would know more about the settings on the TV set) or Sonos’ support (they might be able to see why the ARC handshake is being rejected, not sure what data they get in a diagnostic) would be helpful.
Posting screenshots of the audio settings from the TVs, or at least a typed out description of them might, and I stress might, help us help you. I think you’ve defined that the issue isn’t the cable between the two devices, so where the focus needs to be is where the ARC handshake isn’t occurring in order for the TV set(s) to recognize the attached Sonos speaker. And there is no setting in the Sonos to turn on or off CEC (ARC), it is always on.
OK…you’ve probably received the best advice thus far. Here’s one last remote possibility.
After the most recent update I received no sound thru my Arc Ultra connected to my LG. The model of my LG is several years older than your so that’s of no consequence.
Back to my no sound issue. I left both the Arc Ultra and LG powered on. I removed power from the Arc Ultra. The sound switched to the LG. I restored power to the Arc Ultra and after 2-3 seconds audio returned to it.
As I said it’s a very remote possibility…but worth a try. If that doesn’t work follow the last post by
Edit: If LG tech support is uncooperative…depending upon if you are still within the return window… return it as defective and get another.
Thanks for your help guys. I’ve been at this for days now and it’s wearing me down. Had a long call with Sonos support who told me to contact LG. Then a call with LG who told me to contact Sonos. Went through multiple test scenarios with both support teams but the arc doesn’t recognise the tv and the tv doesn’t recognise the arc so kinds floundering right now.
See the Edit to my last post.
See the Edit to my last post.
this is actually the second set I’ve had. I returned the 1st one 
. Makes me wonder if there is a firmware compatibility issue?
Hard to believe, if they’ve implemented eARC to the specifications set by the consortium. Sonos appears to, since it interfaces with all other eARC TVs. And you’d think there would be more people experiencing than just one person. But I suppose it is possible, as the number of users who have this exact TV set may be tiny.
See the Edit to my last post.
this is actually the second set I’ve had. I returned the 1st one . Makes me wonder if there is a firmware compatibility issue?
WOW!
Here’s the litmus test. Reconnect your old set. If the Arc works then all good. Get another LG model…if the Arc works…then all good…and we now know there is a firmware and/or CEC implementation error with the LG model that started this post.
On the other hand IF the Arc no longer responds to your old set then there’s a case to be made for a defective Arc.
Moderator edit: Removed instances of the word Ultra prior to marking as Best Answer
The OP posted about an Arc, not an Arc Ultra.
Ah heck…getting my Arc’s crossed 🤪
I have an inherent (seemingly) mistrust of ‘high end’ HDMI cables, particularly, at least in my experience, as they rarely identify which ‘version’ of HDMI they are. For eARC to work, they certainly need to be a later spec, even high speed ‘older’ cables won’t carry the signal. Do yours identify which version of HDMI they are? Most often, I’ve found it printed on the cable itself, or in the original packaging, which I rarely keep.
Have LG G4 77in and purchased the Fusion 8k brand to use with TV/Xbox/Sonos. Figured with 8k cables have more bandwidth for video, sound, etc. The cable did not work with the Xbox at all. No signal sent or received with TV and Xbox. Tried 2 different cable lengths and no luck.
I still prefer to purchase the “better” cables even though more expensive. They seem to work better when they work, not sure if placebo effect or legit. But after that experience, really starting to rethink that mindset.
Also, this may be relevant, HDMI2 is the eARC port on LG TVs:
https://www.rtings.com/tv/reviews/lg/g4-oled
There have been widespread reports of black screens, lines, or fuzziness issues with the HDMI 2 port that occur when switching from the TV's native apps to a device plugged into HDMI 2. We tested for this during our initial testing phase and extensively retested the port again to see if we encountered the problem. After further testing, we didn't experience this issue, so it's not a problem that affects every unit.
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