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.

I had the motherboard now changed for over a week. In that time I tried other devices I previously had delays with: Sonos bars, Xbox one x, PS4 pro, Astro mixamp etc. No more delays over optical or hdmi arc.

I can only repeat myself. If you experience delays with your LG tv it’s most likely the motherboard and you have to be persistent with the LG customers team for a replacement. It took the engineer 10 mins to swap it and all problems are solved. Please don’t waste your time with settings and splitters etc.

LGOLED65C8PUA owner here with PlayBar and an ATT Uverse.

I can confirm that the lip sync delay is still there. The only way the lip sync delay is not there is if i use the built in smart apps or if I directly connect the optical cable to the the source(ps4,uverse box, etc.)

I have called Sonos and they kind of hinted to me its an LG Problem but they wouldn't come out and say it. Kind of gave me the typical run around..maybe its your HDMI cable, maybe its your optical cable, basically low level technical advice.

I have called LG and was supposed to get a call today from LG VIP OLED Tech Team, as you can imagine I never got the phone call...

This is not going to get fixed guys from LG or Sonos!!


Bottom line: If you want this to work you are going to have to buy aftermarket equipment to split the connection.


I'll keep this updated if anything changes after the call with LG.

I just posted my review on amazon and gave the beam 1 star due to this issue. I also bought aftermarket equipment to get this resolved since i got this on a good deal: https://www.amazon.com/gp/product/B06XRT9VGL/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

This fixes the lag issue but then it completely breaks Netflix and Amazon Prime Videos which use DD+ for their high end videos. Everyone watches Netflix these days but guess what Sonos doesn’t support DD+ cuz they have awful Codec support and since you’re now bypassing the TV it wont convert the DD+ to DD and u get no sound or u have to go into the settings every single time u play something and manually change it to stereo. Also, if u move to an hdmi splitter u regain audio sync but then u lose CEC and Alexa capabilities.

Yes, i recognize this is an LG issue but the Beam was built as an accessory to the TV and not vice versa so they do get a lot of the responsibility. If you buy a bluetooth speaker and it only works with Android phones and not iphones you don't get mad at Apple. It's the accessory maker that gets most the fault. One is designed to support the other and if it doesn't it's a failure.

It would also be nice if Sonos actually put together a list of incompatible TV's. They keep saying theyre aware of the issue on "some Samsung, Sony, LG TV's." Which ones? People should know this before purchasing.

Side note: I really wanted to like this product cuz i went to UCSB and Sonos is a Santa Barbara company but i think they pushed this out right before the IPO to try to boost sales as a business strategy to inflate their stock price.

is this issue only with playbar? i only have the problemwit amazon prime.

Been following this thread for quite some time. Here's my current setup:

LG OLED B7A
Sonos 5.1 setup (2x play1's, soundbar, sub)
ATT U-verse DVR Box

I've been experiencing the lip sync delay for about a year now. Fighting with LG over the phone for quite a while. They finally sent over a tech who replaced the main board, and I made him confirm that it was a new, 2018 model. New board installed and it did NOTHING to help the problem. Still seeing significant lip-sync delays when audio output is set to surround/5.1 on the cable box.

While the tech was here, he called into LG engineering and the guy on the phone told him it was a cable box issue. I refuted this, because prior to signing up with ATT I had FIOS and experienced the exact same issue. LG claims this is a Sonos issue. The same problem persists: If the audio output from the cable box is on Stereo, everything is in sync. Once I change the output to surround/5.1, I notice a significant delay. The problem is, if the output is in Stereo, I don't experience the "full" 5.1 surround, which sucks. If I change it to 5.1, sounds great, but way out of sync.

I'll keep following this thread to see if anyone discovers a fix for this. What I can confirm is that changing out the main board did nothing for me, but it seems to have worked for Azurik777. I may call ATT and request a new DVR box, but I'm hesitant to do so because I don't want to lose all the stuff I have on my DVR. I'm hoping either Sonos or LG can (finally) come up with a fix for this.

It's not only a LG problem. I have a Philips 55POS9002 (OLED) TV. When using Netflix through the Apple TV everything is in sync. But when I'm using mine cablebox from Telenet (Belgium) there is sometime a lip sync issue. it really depends on what kind of audio signal is transmitting. When I change the audio settings on the TV from multichannel (bypass) to stereo. Everything is fine again.

When so many different TV's are having this problem from different brands then I think the fault is on the Sonos.

I don't understand that. From my perspective, if the Sonos is working fine in one configuration, then it should be fine in all. So if it's fine in Netflix, from the Sonos perspective there's no change from their side on using your Telenet box. The data comes through the TV. If there's an added delay, it's occurring before the signal gets to the Sonos, not after. Unless in some fashion you're changing the setting on the Sonos using your controller when you switch from Netflix to Telenet?

For all practical purposes, the Sonos is a "dumb" unit. It takes the data presented to it, does a minimum of decoding, and spits it out. It can't tell the difference between the Dolby Digital on Netflix versus the Dolby Digital from Telenet. There has to be something upstream of the Sonos device that's causing the issue. I don't know about your Philips, but several folks with LG models have gotten hardware replaced that has fixed the path of the data that goes through the TV and eliminated the issue. Some LG folks have gotten new firmware / software updates that has rectified the problem. Those two data points lead me to believe that the fault isn't on Sonos, but instead somewhere else. It could be your TV, it could be the Telenet box. And I'd think it would be fairly easy to test where the problem is, assuming there's an optical output on your Telenet box. Just connect the PLAYBAR to that, and see if there's still a lipsync problem. If there is, then I'd bet the problem is with the Telenet box (since the Apple TV is playing fine), but if the lipsync issue goes away, then it is the path through the TV set that is the problem. and you might want to contact Philips to see if there is a software update that you could apply, or if they're aware of an issue.

Frankly, I'd also try a different port to connect the Telenet box to your TV, on the offhand chance there's an issue with one of the HDMI ports, but that's not terribly likely.

At the end of the day, if it were indeed a Sonos issue, we'd see posts from every single TV manufacturer here, on a daily basis. We don't. It's normally Samsung, LG, and now your report on a Philips. And each one of those who have purchased an HDMI splitter with an optical output have reported that the problem goes away, which certainly leads me to believe the issue remains with the TV set's processing of the Digital Optical output.

Sorry to be so argumentative. This certainly isn't your fault. I just don't happen to share your opinion that this is a Sonos issue.

So if it's fine in Netflix, from the Sonos perspective there's no change from their side on using your Telenet box.

I have the same issue with the YouTube app on Netflix. I know the youTube app on the ATV does only support at the moment stereo. But I'm having different results when using YouTube on mine Smart TV which does support different audio signals (surround,...)

Like I said before it really depends on the audio signal which Sonos is getting. When reading different forums you will find that many people are having lip sync issues.

Understood. It's my contention that the delay is being introduced inside the TV, which runs the different sound types (stereo versus Dolby Digital 5.1) through different paths inside the hardware.

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.

Update - a week or so in, Sony HAVEN'T fixed this completely and there are still some brightness issues on camera changes, but they are greatly reduced from how they used to be when Sync was ON. Debating with myself whether or not to go back to my optical switch and wait to see if Sony do better in another firmware update.