Sonos beam lip sync issue LG OLED55C7V

Ensure your Beam is connected to the eARC HDMI port on the TV, and set your TV’s output settings to Bitstream if available and ‘pass-through’ so your Apple TV’s sound isn’t processed by the TV on way to the Beam.

Also check your TV’s audio delay setting - it should be set at zero probably. 

It won’t be a Sonos issue, as that can only play what it is sent. It will be your TV primarily, then the Apple TV. Both have their own sound settings that must be correct.

Yes the Beam is connected with eARC HDMI port. I set the sync on bypass on my tv as well. It’s better now, but not perfect. On my tv there’s also something called DTV sound settings. It’s now on Auto. But the choices I have is:

• MPEG
• Dolby digital
• Dolby digital plus
• HE-AAC
• Auto

Should I set my Apple TV on Stereo mix out maybe?

You say it’s not Sonos. Well, I didn’t have problems with this before with other brands. I then used optical cable though. 

Are you certain the HDMI port is eARC and not just ARC? The specs I have found online suggest HDMI ARC? If so, that could be the issue. Another forum user the other day had sync issues with their Beam and LG which only had ARC. The eARC is often key in syncing on the Beam.

However, certainly try the different DTV settings and see. You can always go back to Auto.

Your Apple TV settings should also probably be as follows (under Settings - Video and Audio)

Audio Output - Receiver Speakers (all being well this will be shown already)

Audio Format - Change Format - Off 

Audio Format - Immersive Audio - Dolby Atmos - On

Audio Mode - Auto

But also under Video, ensure you have:

Format - 4K SDR - it sounds counterintuitive to have SDR but it makes sure all content displays properly, including the Apple TV menu, with HDR kicking in only when needed by ensuring the following is selected:

Match Content - Range and Frame Rate

HDMI Format - YCbCr

Chroma - 4.4.4

Matching frame rate additionally helps ensure the audio and video content match up.

Try these and see how you get on…

Thanks Rhonny, I will setup all these settings on my Apple TV and see if it gets better. 
 

Yes it’s only HDMI ARC and not eARC. Should I try using the included hdmi to optical adapter if I don’t get it synced?

Always worth a try. It’s not a permanent thing if it doesn't work but HDMI-ARC might work better with optical, especially as that’s how it worked best for you before.

The only thing to say is that I don’t think the Beam will produce Dolby Atmos over optical.

So perhaps try the Apple TV settings first, and see how that goes.

Ok thanks. I will try this with Apple TV first then. 
 

As you seem to be good at this I need to ask you another thing. I experience that the Beam has a very high difference when it comes to levels of speech and sound effects. The speech is kind of low and the music or sound effects gets very high. Too high I should say. Do you recommend any settings anywhere to avoid this?

On the Sonos app’s Now Playing screen when watching TV, tap the Speech Enhancement option which should raise the speech levels by enhancing the middle frequencies. See if that helps to provide a better balance of sound. 

There is also an option in the Apple TV settings where I can decrease the sound and music effects. But this is also nothing I needed to do before. Hmm. 

It’s also worth removing power to the tv and Beam, so the handshake is reestablished when power is restored. This has helped with sync issues according to posts on other threads. 

I did have all the Audio setups above in my Apple TV. But in the video settings I changed:

Match Content - Range and Frame Rate: ON

Chroma - 4.4.4

And then I also pulled the power plugs to everything to make the handshake again. And now the sync is back! :)

But I still think that the levels of speech and sound effects/Music differs too much