If you're experiencing audio delay issues, read this

I had the same severe sound delay/ lip sync issues. No firmware and no settings fixed it. Just had an LG engineer out who replaced the whole motherboard. All my picture settings were gone but also no more sound delays issues when passing through DD 5.1! Not with my Sonos Beam via arc or other devices via optical and PS4 pro!!

Appears LG has an up to date motherboard and I suggest to contact customer services who were quite good in arranging a swift replacement.

Please don’t bother with firmware etc if you have issues as it will most likely be the motherboard. I purchased my C7 55 in October 2017 if someone needs it.

Azurik777 when you contacted LG Support did you tell them the audio delay issues were present when external devices like Sonos Beam were connected? When I contacted LG Support they told me to take up the issue w, Sonos. Thanks.

I explained that all my external sound sources (hdmi arc/ optical) including Sonos devices would have severe audio delay when DD 5.1 is passing through the tv to the devices. You have to mention all the buzz words I guess like AV adjustment not working, bypass not working, firmware fully up to date etc. Or just tell them you are aware that motherboards are being switched as a result of the fault and you want that to happen with yours too. Clearly no firmware update will fix this and it’s a hardware fault. The newer c7s might have the up to date board installed hence some people do not suffer with the delay.

Hi there,
I was wondering if anyone had seen this issue with Panasonic devices ? I have tried a lot of the steps dscribed in this thread and the only thing that’s made a difference has been the hdmi/optical splitter - Panasonic are coming to swop the mother board in the next week but Based on this thread suspect that won’t fix the issue

Hi everyone,

I'm having some audio sync issues with my current setup and am looking for any advice you may have to resolve them.

My current setup:
LG OLED C8 65" TV
Sonos Playbase + Sub + 2 Sonos Ones
Apple TV 4K

When playing Netflix, Hulu, and HBO GO content through Apple TV, sometimes I notice audio sync issues ranging from slight to fairly severe audio delays. The issues seem to be content-specific. When I use the LG built-in Netflix and Hulu apps, there are no audio sync issues. Unfortunately, there is no LG HBO GO app, so I am not able to test that content.

Switching to PCM audio when using the Apple TV resolves the sync issues. The LG Audio Sync feature has no impact on the sync issues (since the audio is delayed and not ahead of the video source).

I have read a few comments about a splitter of some kind. Would someone be able to provide me with a little more detail on that and if it would resolve my issues? I'd really like to continue using the Apple TV if I can.

If others have any additional advice, I'd really appreciate it.

Thanks in advance.

You can find optical/HDMI splitters of many types on Amazon, just requires a search. And certainly, that would remove the TV from potential issue list. But before I would go that far (since I would consider it a pain to have yet another box that I need to have a remote for to change inputs), I'd suggest looking at the audio settings for the TV set. Make sure that all of the settings are basically turned off. Anything that changes the audio output would add delay. I'm not particularly familiar with the C8, although I'd admit to admiring it, but it's worth double checking that anything in the settings that changes the sound in any way would be a potential issue. And frankly, it's also worth touching base with LG, to see if they have something, like a new beta version of the firmware, etc, that alters the current setup. This issue seems to crop up frequently with both Samsung and LG, and one of the two actually is replacing boards in their TVs due to this issue, although I don't remember which one. I've got a Vizio that's a couple of years old that has zero issue with this kind of thing, but then I've turned off all extra sound processing as well.

I'm 95% confident it's the TV that's causing this issue. Purchasing a splitter might prove that point, albeit as I recall they're somewhere in the $100 area and up. And honestly, I could be wrong....but if so, I'd expect a lot more complaints from other people who purchased TVs from other manufacturers, and I just don't see that at this point. Mostly from LG and Samsung. That might be a reflection of how popular those TVs are, which is why I went with my 95% comment, but still.....

You can find optical/HDMI splitters of many types on Amazon, just requires a search. And certainly, that would remove the TV from potential issue list. But before I would go that far (since I would consider it a pain to have yet another box that I need to have a remote for to change inputs), I'd suggest looking at the audio settings for the TV set. Make sure that all of the settings are basically turned off. Anything that changes the audio output would add delay. I'm not particularly familiar with the C8, although I'd admit to admiring it, but it's worth double checking that anything in the settings that changes the sound in any way would be a potential issue. And frankly, it's also worth touching base with LG, to see if they have something, like a new beta version of the firmware, etc, that alters the current setup. This issue seems to crop up frequently with both Samsung and LG, and one of the two actually is replacing boards in their TVs due to this issue, although I don't remember which one. I've got a Vizio that's a couple of years old that has zero issue with this kind of thing, but then I've turned off all extra sound processing as well.

I'm 95% confident it's the TV that's causing this issue. Purchasing a splitter might prove that point, albeit as I recall they're somewhere in the $100 area and up. And honestly, I could be wrong....but if so, I'd expect a lot more complaints from other people who purchased TVs from other manufacturers, and I just don't see that at this point. Mostly from LG and Samsung. That might be a reflection of how popular those TVs are, which is why I went with my 95% comment, but still.....

Thank you. I checked through my LG TV's settings, and there are no settings that are turned on when the Optical mode is selected for connection to my Sonos. I spoke with LG and Sonos last night. LG suggested connecting my Apple TV to the Sonos Playbase and then connecting the Playbase to my TV - but I don't think that's possible with the connections that are available on Apple TV and the Playbase. They also mentioned something about an MHL converter, but I don't know much about these.

Sonos created a case number for me and mentioned that this is an issue they've been reviewing. They told me the only fix at this point is to switch to PCM - but there is a very noticeable degradation in the audio quality when I do this. Fairly frustrating that this is an issue with devices that are supposedly of such high quality. I think I will have to live with using the built-in LG apps for most content. Unfortunately, LG does not have an HBO GO app, so PCM audio looks to be the only way to resolve the issues with that content.

I brought up the idea of an audio splitter, but Sonos seemed to believe that would drastically reduce the quality of the audio. Any sense if that's really true? Appreciate this community's help.

Interesting.

I'm not terribly familiar with the LG, most of what I know has been gleaned from folks posting here.

While their suggestion to connect the Apple TV directly is a good one, you're right in that there's no simple way to do that. That's where the splitter comes in, though 🙂

I've never heard of an MHL converter, either. A quick look on Amazon suggests it's a device to swap from micro-USB to HDMI, so I'm not sure how that applies here.

What you're looking for is something like this:

https://www.flexson.com/by-sonos-product/sonos-playbase/flexson-3-input-hdmi-switch-audio-converter-for-sonos-playbar

I'm a fan of Flexson, every piece of kit I've purchased from them has been solidly built, although I've not purchased any of their electronic gear. The simple fact is that there are a multitude of similar devices available, pick one that matches your needs.

The audio splitter device should not have any impact on the quality of the audio. It's digital. There's only the potential of lag that you'd be dealing with, in all other respects a zero is a zero, a one is a one. And I've read hundreds of posts in this forum from people who have said that it resolved their issues. I can only assume that the rep that you spoke with was misinformed.

Interesting.

I'm not terribly familiar with the LG, most of what I know has been gleaned from folks posting here.

While their suggestion to connect the Apple TV directly is a good one, you're right in that there's no simple way to do that. That's where the splitter comes in, though 🙂

I've never heard of an MHL converter, either. A quick look on Amazon suggests it's a device to swap from micro-USB to HDMI, so I'm not sure how that applies here.

What you're looking for is something like this:

https://www.flexson.com/by-sonos-product/sonos-playbase/flexson-3-input-hdmi-switch-audio-converter-for-sonos-playbar

I'm a fan of Flexson, every piece of kit I've purchased from them has been solidly built, although I've not purchased any of their electronic gear. The simple fact is that there are a multitude of similar devices available, pick one that matches your needs.

The audio splitter device should not have any impact on the quality of the audio. It's digital. There's only the potential of lag that you'd be dealing with, in all other respects a zero is a zero, a one is a one. And I've read hundreds of posts in this forum from people who have said that it resolved their issues. I can only assume that the rep that you spoke with was misinformed.

Bruce - thanks for all your help and suggestions so far. I looked back in this thread and saw that some folks recommended "forcing" Dolby 5.1 on the Apple TV as a solution to the lip sync issue.

Doing this has resolved my problem for most of the content I watch. I noticed a slight delay in the audio on an episode of Black Mirror on Netflix, but even that is much improved.

Thanks everyone!

After purchasing Sonos Playbar and some Sonos One's this summer I have experienced the same lipsync issue with LG OLED 65'' B7V. Connecting the Playbar to Xbox One X optical out and chromecast to the Xbox HDMI input solved the sound issue, however, it introduced the no 4K from Chromecast and completely renders webos useless issue. After beeing in contact with LG now for around 3-4 weeks without getting closer to any solution than when I first reached out to them I have now contacted the sales channel for the TV in paralell to my contact with LG and asked for a resolution on guarantee. I want the issue resolved or exhange the TV to one that works correctly with Dolby Digital 5.1 over toslink. My cheap-o Sony office tv works like a charm with the soundbar and has no issues with DD 5.1 over toslink. It's strange how such a good tv can exist with non-functioning dd 5.1. Current status of this issue is completely unacceptable to me. I could just as well have kept my very old FullHD Panasonic plasma for the same experience with great black levels.

Having lived with the issue since I bought a Sony XE9005 in January (now an XF9005, swapped by Sony) I can report that the recent Sony firmware update (Sept 18) does appear to solve this if you connect via optical out from the TV to the Playbar.

Previously, if I switched Audio Sync ON, it synced the sound but produced a brightness flash on camera changes, but the update has solved this (although it's not directly addressed in the list of issues from Sony).

For the first time in 9 months I have been able to remove the optical switch I've been using to get my Sky Q box audio and video to sync up.