I have a 2020 LG CX TV with an Arc, 2 Ones and a sub that has been working fine for a year. Earlier today, the sound stopped coming through the Sonos speakers. I was able to get the sound to work through the speakers but the LG remote no longer controls the volume. I have tried the manual setup controls from other threads but it doesn’t work. Also, if I try to set up the TV in the Sonos app, I get an error that the Arc Mode is not connected but it is.
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Userlevel 5
+14
Nope I was wrong, did it again. Damn.
Userlevel 5
+14
Update. That did the trick. Thank you so much for your help!!!
“Reboot” is simply removing power. This will not destroy any fundamental SONOS settings.
I’m annoyed that this is sometimes required. Unfortunately, there are some details about the negotiation process that are not explicitly specified in the standard and each manufacturer might have a slightly different interpretation of the standard. When there is an issue the common answer is “we have never seen this before” or “it’s not our fault”. After a while one or the other manufacturer might receive so many complaints about a specific issue that they will release an update to work around the issue. Meanwhile, the other manufacturer might also release a change and the two changes might interact poorly, generating another round of “not our problem”.
That HDMI switch complicates things because the switch will present itself to the TV as a single device, but the device identity and supported audio/video/control features might be different for each input device attached to the switch. There are somewhat expensive solutions to this. The switching device will include enough extra electronics to present the best possible interface options to each input and output device. The switch will mediate any differences. A side benefit might be almost instant switching between input devices. The dark period that you observe while switching inputs is due to the negotiation between devices. At minimum, each device must prove that it honors intellectual property rights protection. With the extra electronics on board the input and output devices never need to renegotiate anything.
Userlevel 5
+14
In this case disconnecting one end will suffice.
Each situation is a little different. Sometimes one or both devices must be rebooted while the cable is detached. Some TV’s must be powered down for two minutes before they will reboot.
I recommend starting from power down with nothing connected to the TV. Power up the TV and the soundbar, then attach the cable.
As the connection is made, the TV and soundbar will negotiate which audio and video formats are common. If you have a bunch of games and players attached at that time, the negotiation might become confused by too much chatter.
Sorry one more clarification, when you say power down and up do you mean unplug power or from an off position. Also, do I need to set up everything on the sonos app again, that is delete the rears and sub and re add them?
In this case disconnecting one end will suffice.
Each situation is a little different. Sometimes one or both devices must be rebooted while the cable is detached. Some TV’s must be powered down for two minutes before they will reboot.
I recommend starting from power down with nothing connected to the TV. Power up the TV and the soundbar, then attach the cable.
As the connection is made, the TV and soundbar will negotiate which audio and video formats are common. If you have a bunch of games and players attached at that time, the negotiation might become confused by too much chatter.
Userlevel 5
+14
So I just ran into this issue with my 65 lg cx. My Apple tv is not able to control it nor my magic remote. Also have ps5 and gaming switch with multiple gaming systems attached. My question is. Can i just disconnect the devices from hdmi themselves or do i have to disconnect them from the back of the tv. Reason i ask is my tv is on a wall without a swing out and it’s tight and a pain. Do i have to unplug the power of all of them or just the tv?
This just happened to me today on my LG 55GX TV which is connected to my sonos arc. I had the standard issue that when I used the LG magic remote, the volume + / - icons appeared on the screen but the actual volume coming from the arc was not changing. I could only change the volume from the sound bar itself or on the sonos app. For me all I had to do was disconnect the hdmi cable from my PS4 and it all worked again. I didn't have to turn the TV or the arc off, or even unplug any of the other hdmi cables. I then plugged the PS4 hdmi back in, but the issue came back immediately so I've pulled in back out and all is good again. It may be worth noting that the hdmi cable I use for the PS4 is the only older hdmi cable which I have in use - the rest are newer ultra high speed hdmi cables. So maybe it's something to do with older hdmi cables?
Had the same issue re-occur a couple of times now. The “reliable” fix is:
1. disconnect all hdmi cables except ARC.
2. power off everything for about 3 min
3. restart
4. reconnect other hdmi cables
The problem reoccurs every few months, but this fix has been working consistently for me. Very frustrating though!!! I wish LG would fix this.
I had already unplugged my Apple TV some time ago, so knew that couldn’t be the issue. And I had no devices connected to the TV…. Or did I….
On the end of my HDMI 3 cable, I had an Apple Mac HDMI to USB-C adapter. You know the ones… white… take Macbook port to HDMI, power and standard USB. No Macbook was connected. No “device”. Just an adapter...
Unplugged it a hey presto….
Thank you so much for posting this! Just had the same issue. What made things worse, everything seemed to be working if I had my MacBook connected to the USB-C adapter even if I wasn’t using it or that input. I’d remove the MacBook, forget about, have volume failures, go through the “power cycle everything” steps, and presto things worked again….until I attached and detached my MacBook again.
I just noticed it might be an issue with the combination of Apple adapter and Apple TV even though they are on different inputs. I recently started having “You haven’t setup your remote” messages on my Apple TV when I tried adjusting the volume via the Apple TV Remote. It appears to be the same issue...it happens after I connect the usb-c adaptor.
What I’ve noticed is the “Turn On Your TV with Your Remote” option in the Apple TV settings turns into a “Control TVs and Receivers” option once the usb-c adapter is added on another HDMI cable. That’s when the volume control on my LG Remote and Apple Remote stop working.
I have a feeling the adapter has its own volume control system from the good old days when MacBooks shipped with an Apple Remote so you could adjust volume and play/pause media remotely.
Posting all these details here in case someone else starts having the same issues.
I had the same problem, I thought my remote was broken and bought a new one but it was useless. What a waste :(
Userlevel 1
+1
Hello,
I have exactly the same problem since I replaced my Panasonic plasma TV last weekend with an Oled LG65G2.
I will try the solutions suggested here. 🙏🏻
Hi everyone,
Given the HUGE amount of posts on here, and LG support pages, and REDDIT, and AVForums, etc... on the issues of interworking between ARC and LG TV’s I thought I’d post my own experience, which I hadn’t seen a similar answer for anywhere else…
To clarify, I am talking about LG TV (in my case OLED 55GX6) using ARC port (and eARC enabled) straight in to the HDMI port of the ARC, and specifically about the issue with loss of volume control from the Magic remote, and occasionally leading to loss of sound.
(NOT referring to the much promoted SONOS guide on working with the TV Optical out and ARC Optical to HDMI adapter and programming the Magic remote to use IR)
Having initially plugged this in and everything working a dream, and enjoying the Mandalorian in Dolby Atmos… Suddenly one day I started having issues. These started with volume controls failing, instead coming up with a “no entry” sign where the volume + or - were on the screen. And I noticed that the TV setup and Remote setup in the Sonos app failed mid-way through when I tried to remedy.
This was frustrating as I had my Magic remote for TV, also controlling my AppleTV on HDMI port 1, but had to then pick up my phone/Sonos app to adjust volume…
Following lots of googling and reading, I assumed the issue had been triggered by an auto software update or a power cut. I reset the TV, reset the ARC. Changed my very good own purchased cable for the Sonos ARC supplied one. Took both back to manufacturer settings. Checked for software updates. Tried turning Simplink off. Tried turning it on and going through the Universal Device Control menu to setup Sonos. Tried the same but using Phillips instead of Sonos (as recommended by Sonos). Tried all the above in various different orders. Nothing worked.
I unplugged the AppleTV, and tried all again, and actually managed to break the sound out from the ARC all together. When I chose “internal speaker” on LG, everything fine, when I went to ARC, nothing.
I was pulling my hair out.
Got Sonos support on the line. Following a full power cycle (about the 12th over two days….) and with their support, I finally got sound back. But hey ho, no volume control still.
I started to play with de-registering and re-registering the Magic remote, and at one point got the + and - volume controls back on screen… but they didn’t actually do anything. Pretty soon I was back to square one, ARC sound, but no volume control from Magic remote and failing TV setup and Remote setup in Sonos app.
But it was becoming clear the TV and the remote were talking. The TV was receiving instruction to adjust volume. But the TV wasn’t executing. So trying my best to ignore every single bit of Sonos advice out there re ARC and LG, which basically takes you down the Optical out and IR route, I started to focus on the fact that the TV needed to send the signal to the ARC over CEC. Remote to TV. TV to ARC. So the problem must be CEC TV to ARC.
I recalled that when on the chat to Sonos support, the engineer asked me to unplug the Apple TV that was in the LG TV HDMI 1, as sometimes some devices can create a CEC “storm” with the LG TV….
I had already unplugged my Apple TV some time ago, so knew that couldn’t be the issue. And I had no devices connected to the TV…. Or did I….
On the end of my HDMI 3 cable, I had an Apple Mac HDMI to USB-C adapter. You know the ones… white… take Macbook port to HDMI, power and standard USB. No Macbook was connected. No “device”. Just an adapter...
Unplugged it a hey presto….
Everything works wonderfully. Pretty much out the box. Unless you have a “device” (or adapter...) on another HDMI port causing a CEC storm…
Oh, and the TV setup in the app now works fine. But the Remote setup in Sonos app still won’t work. And shouldnt. Don’t bother with it, again, it seems to be relevant if you’re trying to use IR from Magic Remote.
So… hopefully this helps the huge amount of others out there fix their LG TV to ARC issues. (Not using Optical port!). Ensure you don’t have ANYTHING else plugged in to your LG TV HDMI ports, not even an adapter, and go from there.
Hopefully Sonos will work on updating FAQ’s etc to address the issues specifically to ARC/LG and CEC issues, not just the current Optical adapter focused ones.
Oh my goodness, I was about to pull my hair out (the little I have left) with an issue similar to yours. After reading this, I noticed I had 2 unused HDMI cables plugged into my HDMI 3 and HDMI 4 ports, I unplugged them, tried adding my LG CX to my Beam Gen 2 in the Sonos app and it magically worked and I can now use my LG magic remote to control volume again. So dumb!
Had similar issues to others. After a power outage the set top remote and the magic remote wouldn’t change the volume on my Arc via the LG CX. You could see the +/- on the screen and even the mute but it didn’t control the volume on the Arc.
Saw
Thanks
Update - decided to strip back the ARC by deleting the surrounds and power cycling it all with the ARC cable out…. and…. for now it works… have readded the surrounds and am getting ATMOS with volume control and mute. When I readded the ARC cable the TV showed that it auto detected a Sonos device so hoping this is the solution..
Same issue here on LG CX running 4:30:55 (and the previous two releases) - no control over volume or mute even though the screen shows that the remote is asking for changes.
I have an LG C9 + ARC in another room and that works just fine. When I power up the C9 I get a momentary green light on the ARC and it then all works fine. With the CX I do not get a green light on the ARC on power on - but I do get sound from the ARC - however there is no volume or mute control of the ARC - the screen shows that the remote is asking for changes but there are none.
I have swapped the ARC from the CX to the C9 (with the cable) and it all works fine…. there must be some compatibility issues (I have no other HDMI ports in use) -- any ideas ???
And as if by magic, everything is working again. I did disconnect my PS4 when I turned on my LG tv.
I started experiencing this problem yesterday. I see the + and - on the OSD, but the remote does nothing. I am able to control the volume using the Sonos app.
Ya..pretty ridiculous Arc connects setup like a champ.volume control on lg 2021 c1 magic remote controls volume on arc for a few min..then bam..gone..I see the volume symbols as well on tv..bit no control all of a sudden .Tried everything on the forum..etc...
My apologies..I think it's an lg thing..my firestick remote will control the volume regardless of what i plug into hdmi..but magic remote will stop adjusting the volume once i plug my firestick in..weird
Ya..pretty ridiculous Arc connects setup like a champ.volume control on lg 2021 c1 magic remote controls volume on arc for a few min..then bam..gone..I see the volume symbols as well on tv..bit no control all of a sudden .Tried everything on the forum..etc...
I was able to get our system fixed by unplugging HDMI cables using Glens recommendation above but alas, the problem is back. I unplugged all cables from the TV but the remote will still not control the volume anymore. Anyone else having issues recently?
Same here😟
Hey guys,
I have the same problems with my Sony A90j, the Arc works quite well for some time but suddenly the volume control stops working or the Arc won’t output any sound at all.
I experienced similar behaviour as
After disconnecting the adapter and the PS4, the Arc resumed to work normally.
First i thought this was a problem with my Sony TV but after reading that you guys have the same problem with your LG TV, it might well be a Sonos CEC problem.
Nevertheless, this problem has to be fixed since it is not bearable to disconnect all HDMI input souces every few days/weeks when the Arc decides to not work again…
Same issue here. LG OLED65c1AUP. Universal Remote says Sonos is set up, shows volume + and minus, but no actual change in volume in Sonos Arc. Sonos app says there is an issue with HDMI and if I go through the fix steps it guides me through, I get an error message that CEC is not on while it is on.
I was able to get our system fixed by unplugging HDMI cables using Glens recommendation above but alas, the problem is back. I unplugged all cables from the TV but the remote will still not control the volume anymore. Anyone else having issues recently?
I had the same exact adapter plugged into hdmi 4 with nothing on the other end. All better now. I love you.
I may have spoken too soon. Even without the hdmi switch the problem reoccurs. It’s not just hdmi cec that’s messed up, the tv stops detecting the Sonos on startup and switches to internal speaker and I have to switch it back every time. It also breaks earc as a 4K disc with true hd downgrades audio to DD5.1. This all started for me after the last firmware update from LG. Truly risible software from LG.
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