Arc stops working with TV , was working fine

I have. Just a reminder that this worked fine for 18 months and then suddenly stopped working without any config changes.

Can you try another TV, to determine if it is the TV or the Beam?

Can you tell if your TV took a firmware update? Also, what TV?

It’s an LG 50” but I don’t have the model with me at the moment. I actually have 2 of the same TV and 2 SONOS Beams in my house. One set is fine and the other is experiencing this problem so I suspect that the TV software isn’t the issue but rather the BEAM or the ARC port on that particular TV. Really strange though. 

As you have two (more or less) identical setups in the Home, perhaps swap the Beam over (and the HDMI cable too) to see if you can establish where the problem lies.

I’ve had a sonos Arc and a LG GX 77 inch tv for about a year now. Everything was working great until suddenly I had the same issue as most people: TV audio just stopped working for some reason (although music playback worked just fine).
 

I went into my LG tv settings as follows: All settings —> Sound —> additional settings —> I then noticed “eARC” was turned off. I turned it back on and everything works perfectly again.
 

I’m not entirely sure if the eARC setting just turned off on its own or there was some automatic update on the TV that unchecked it.  Anyway maybe this will help someone out there.

Having the same issue here, and it seems like there is not really any good solution. My setup had been working fine for months, and I recently unplugged the sonos from the arc port to plug in another device.

When I tried plugging the sonos beam back into the arc port, the audio would no longer come from the beam/system. I tried running the setup on the app, and the app would tell me that there is no Arc cable connected.

I shut the whole thing off following the steps outlined here, unplugged every device. I did this multiple times until I gave up last night. I tried pretty much every combination of TV on first, Beam on first, which end to plug the hdmi cable into, each with at least a 5 minute period in between. I had every other device unplugged from the TV and powered down while doing this. I left everything unplugged and all hdmi cables unplugged until this morning where I tried again thinking maybe it takes longer than expected to do a full reset. Exact same issue.

HDMI cable works with other devices, and again, had been working fine until it was unplugged.

• Sonos is fully updated.
• TV is fully updated.
• It is not a cable issue, was working with same cable, and same cable works with other devices. Also tried 2 other hdmi cables that I use for my computer setup (both function in that capacity) and get the same issue.
• Settings on the TV are to use the ARC for audio out, including the eARC checkbox another user was talking about.
• Have done a factory reset on the TV, redownloaded/installed updates, hasn’t worked.

TV model: OLED55C1PUB (LG 55” OLED Class C1, 55”)
Sonos Details: Beam Gen 2, with 2 Sonos Play 1s

Sonos has always been super finicky when it comes to connecting to ARC properly. No idea why as its a hardwire connection. I didn’t realize that unplugging the hdmi for a few minutes would forever destroy my ability to use this system. When googling what could be the issue pretty much the only things I found were “did you try resetting it” and “but did you reallllly try resetting it??” and that is it. Super disappointing that there is such apparently such a pervasive issue with connecting and hdmi cable.

Getting ready for my hour long sonos help call where they will make sure I reallllllly reset it though.
 

You stated that “the same cable works with other devices”. Unless you’re talking about other ARC devices, there are unfortunately some cables that were produced before the introduction of ARC and don’t have the necessary connections to do ARC, as required by Sonos. And it’s even more unfortunate that most cables aren’t well labeled. I’m almost at a point where I want to throw away many of my HDMI cables, which are HDMI 1.2 or  HDMI1.4, and not HDMI 2.0 or HDMI 2.1, and replace them with newer cables. But they work fine for video, and I’m such a hoarder…..

The cable that was originally in use was HDMI 2.0, which should be arc compliant. Again, it worked for months before the unplug/replug seemed to throw it all off.

The other cables I have no idea, so true they could just be the wrong kinds. It was more of a last ditch effort by trying to replace each individual part that might be causing the errors. 

I’m going to order a new cable now just to be 100% certain it is not the cable before moving forward.

Probably a smart thing, although there’s also the very slight possibility of corrosion in the actual connector, either on the cable ends (the male part) , or the receptor on either device. Most frequently, this can be overcome in some fashion by simply pulling out and then re-seating the cable. It’s a pretty rare condition, but not impossible. I’ve had it occur on non-HDMI cables mostly. RCA, in particular, but I used to do support for my mother’s elementary school’s video equipment, long before HDMI came out, and ran across it mostly due to poor maintenance by people who were unfamiliar with electrical connections. Just throwing it out there.

As you say, HDMI 2.0 should have covered it. Unfortunately, there are so many different variables here, so attacking them one at a time makes good sense. I don’t think, based on all of the other devices that do work, that it’s an endemic issue with the Arc, but it’s entirely possible that it is specific to yours. Manufacturing isn’t always perfect, but issues are pretty rare. One of the reasons to do that doing a diagnostic and submitting it to Sonos, and calling them so they look at it makes some sense, at the least to remove that as a potential issue. Allows you to focus elsewhere. 

I have the same issue. My ARC stopped working with my SONY A80J TV. I called SONY and they took remote control of my TV and could not work it out. They asked me to call SONOS which I did and they could not work it out. So, I went back to the store from where I purchased the SONY TV and SONOS equipment (JBHIFI) and they thought it was the TV. So, they sent out a brand new SONY A80J and guess what...same problem.

I had no issues with my previous TV. Also when I originally got my SONY TV it was also fine for a few weeks but then the problem started. This is extremely frustrating. I have tried 3 different HDMI cables. I even purchased an expensive high quality 2.1 HDMI cable.I have tried powering this off and on, unplugging HDMI cable's etc etc. I have tried everything!

I also the TV Setup in the SONOS app does not allow me to connect the ARC to the TV. The app just hangs.

To me this is clearly a SONOS issue. Maybe a HDMI connection issue? Something wrong with the HDMI port maybe??

Given this looks to be a common issue? Is there a recall on the SONOS ARC??

Does anyone have a fix for this??

Please help.

BTW - the ARC works just fine with music streaming. It is just s TV issue.