Sonos Beam Apple TV and LG OLED via HDMI-ARC loses connection every power on/off

I’d be awfully tempted to check for an update to the TV’s OS from LG. It sounds like it’s not allowing the CEC connection across HDMI to activate all the time. And I’d also be tempted to pull out the HDMI cables, and then put them back in. Sometimes a reseat fixes a bad pin connection. But if it is a bad HDMI connection, it’s anyone’s bet as to whether that’s in the TV, the cable, or the Beam. Not sure I know how to check that, other than just swapping the cable out, but that doesn’t really prove anything, although it may fix the issue.

👋 hey 

the solution is: turn the IR off in your Sonos app, this way Apple TV remote won’t turn your soundbar off, and they stay connected. 
 

I’m having this same issue ever since getting the new Apple TV and trying to use the ATV remote with HDMI-CEC instead of my Harmony remote.

I’ve tried turning IR and TV auto play off in Sonos settings for the Beam and it doesn’t fix the issue. I don’t want to turn off CEC in the Apple TV settings under Remotes and Devices because I want to be able to use the Apple TV remote as my only remote.

Is there anyone who has an LG OLED, Beam connected via ARC, and an Apple TV 4K able to use the Apple TV remote as a main remote without having the issues stated in this thread? Before I start buying new HDMI cables and trying that I’d like to see if it’s even possible with the current software versions.

I have been having the same issue for a while and was finally able to fix it on my end. I realized that my ATV 4K was set for Atmos for audio out, which my Beam does not support. When I changed the audio out setitng from Atmos to Dolby 5.1 in the ATV settings, this issue was completely resolved - both the remote and beam intermittently not connecting to the LG TV at some power ups. Has worked perfectly since. Maybe this can be helpful!

I’ve been having this same issue, and just found something that has fixed it for me. Go into “Settings”, “All Settings”, “Sound”, “Additional Settings” and then turn off e-arc, then unplug the HDMI cable from your Sonos Beam and plug it back in. The TV should show a notification that the beam was detected and magic remote is ready to control it. After which there shouldn’t (at least in the 5 or 6 power cycles I tried) be any more disconnects. I can confirm that, at least for me, turning e-arc back on made the problem return, and turning it off again restored the proper function. 
 

Overall annoying, and difficult to tell if this is an issue with how the beam handles e-arc or the LG CX. That being said, as far as I can tell the only benefit of e-arc is in playback of lossless audio (probably an issue for some, but not for me as I stream all my content), so maybe just having it off for now is a viable workaround until either Sonos or LG fix the issue. 

This appears to have solved it for me 

Monitoring this closely. $4K+ buy hinges on this.  Used to have high hopes for HEOS but thats done since Apple TV allows use as COMPUTER SPEAKERS via Airplay now.  Nice to not need exotic 40’ HDMI cables or expensive HDbaseT Baluns anymore….  

It would be nice to have this one last problem go away. 

I have the LG CX65 a beam (the Costco one), a pair of play ones and a first Feb ATV 4K.  I have the same issue.   
 

My setup takes volume control away from my apple remote any time it goes to sleep.  If I turn it off and on with the apple remote it works just fine.  If I let it go to screensaver and it turns itself on the next time I turn it on the Sonos won’t work from the apple remote and I have to power cycle the Apple TV to get the Sonia to work with the apple remote.  
 

best setup I have had in my entire life.  Absolute worst experience.  

I hesitate to even suggest this solution, as for many months my LG CX 55 inch OLED (OLED55CXAUA) randomly stopped outputting ARC audio to my [Sonos Beam Gen1 + Play:1x2] system requiring me to physically unplug the Beam’s HDMI cable from HDMI Port 2 on the TV multiple times a week. The TV would just output to its internal speakers while completely ignoring the Sonos setup until I re plugged it in. I was getting to the point of worrying about the TV’s HDMI port 2 getting worn out.

All prior suggested solutions on this website have been temporary at best, but I seem to have found a durable solution that has lasted me the past four weeks of regular usage, found by reading multiple posts about this issue and parsing together a solution through trial and error. 

Of note, I first thought this was an Apple TV / LG CX / Beam problem, but I have realized after changing multiple settings on my Apple TV 4K Gen 2 (tvOS 15.1 with output forced to Dolby 5.1) over many months that it was a red herring because I was just using the Apple TV all the time as the source.

Ultimately, I believe that that LG and Beam are not playing nice through the HDMI-CEC protocols, specifically something to do with power. Sonos and LG engineering will need to figure this out.

First, my firmware versions:

LG CX: 04.30.10

Sonos system: 13.3

Second, my fix:

Gear button on LG remote → All Settings → Connection→ Device Connection Settings → Universal Control Settings → HDMI2(Arc)  - > Manage Settings → Set Manually → Bluetooth / SoundBar → HDMI2 (ARC) → Yes to reset → DO NOT ENABLE “Auto Power Sync” (SIMPLINK is OK to be on) → Scroll down and select Sonos → Next → Done

The only thing that I have noticed different with this setting disabled is that my Apple TV remote’s power button now does not turn on the TV. I have to do this on the LG remote. For me this is a fair trade rather than having to be constantly annoyed that my supposedly first in class, rather expensive system is randomly not working. 

To confirm this fix, two days ago I went back and re enabled Auto Power Sync and I had my first random disconnection in a month today.

 At least for me, having Auto Power Sync disabled is the fix.

Hopefully this is a universal fix for others undergoing this same frustrating issue.