To help , can you explain why you want to do this?

Because there is not always the need to hear with the BEAM, but only with the TV speakers.
I would like to use the BEAM for movies, but for the rest I prefer the TV speakers.

Your TV and the sounbar are not designed to swap easily between the soundbar and the TV-speakers - probably because most users do not buy an expensive soundbar and then want to use the (mostly rubbish) TV speakers. You could try to turn off HDMI-CEC on your TV when you want to use the TV-speakers. I personally would not bother.

Yes of course it's not a big problem, at most I turn off the power to the beam. But I tried to turn off HDMI-CEC and it only works for a few seconds, after which it automatically returns to ON

Please note that Sonos devices are designed to be left on at all times.

so there is no solution to the problem?

I’ll be honest, and as ​@106rallye has already stated, I don’t think anyone has ever asked how to have a sub optimal listening experience before.  If you find the audio is too loud, you can try setting the Night Sound to ‘On’ in the settings for the Beam

Hi ​@michelenicolis 

​@106rallye has already supplied you with the solution:

Through HDMI-CEC, your TV can see you have a soundbar and it also does not understand why you would want to use the TV speakers, but if you wish to do so, you need to prevent the TV from “seeing” the Beam by disabling HDMI-CEC. LG call their version of HDMI-CEC “SIMPLINK” - please disable this in your TV’s settings to be able to use the TV speaker while Beam is connected, and turn it on again to use Beam once more.

I hope this helps.

Yes, that's how it works but only for a few seconds! Because the HDMI CEC flag is automatically activated again. Basically I deactivate it and it reactivates itself

Hi ​@michelenicolis 

In that case, I can only suggest that you contact LG for assistance. Your Sonos Beam is behaving exactly as it should, but your TV is not.

I hope this helps.

No, it's exactly the opposite. The problem is the sound bar that not having a self-contained remote control does not manage the LG SIMPLINK. I spoke with LG's technical support

Hi ​@michelenicolis 

Sorry, but the issue you describe is not related to a remote control in any way. Yes, remotes can send a signal to the Beam to adjust the volume via HDMI-CEC, but that has nothing to do with your TV refusing to disable SIMPLINK.

Your TV is doing the sensible thing, however - using the TV speaker when you have a sound-bar fitted is counter-intuitive. But, I reiterate - the Beam is doing exactly what it is designed to do. There is nothing I or any other member of staff can do to force your TV to disable SIMPLINK if it refuses to do so. Surely you can see that it should be possible - why else would the setting exist in the menu in the first place? It’s LG’s software running on their TV, so you will need to get them to fix this issue.

Have you tried rebooting your TV by unplugging it from power for at least a minute? It may help with getting SIMPLINK disabled, but that is only a guess.

Failing that, it sounds like the next best answer would be to disconnect your Beam from the TV when you don’t want to use it, or unplug it from power.

I hope this helps.

In reality, there is no problem which would request a solution.

This thread reminds me of the time my sister quipped “I can’t hear the TV, the volume is too loud.”