Apple TV 4K audio out of sync

I believe I'm "fixed" now. The Atmos adjustment didn't do anything for me (it was forced off, while using optical out anyway).

My experience: I have the C7 TV. Apple TV 4K is connected to the TV, then audio is optical from the TV down to a SONOS Playbar. Impatiently, I downloaded the 04.70.06 update manually and updated the TV by USB. With that update done, I believe I'm in sync now, at Dolby Vision 4K 60hz, with the Av Sync Adjustment set to -1. Prior to this firmware, setting to -5 (the max) was not enough adjustment to get into sync.

Hey all,

Another person having a similar problem, but mine's a bit different than the rest of you.

Running a LG 65E6P (2016 model, not a 2017) connected to a Marantz SR7011. Audio Sync seems good with SDR and HDR, but Dolby Vision is where it comes into play. On 2016 models, 60Hz for Dolby Vision isn't an option. 30Hz works okay, but has some image judder since the source is 24. The issue is, sound is out of sync for 24Hz sources. And seemingly ONLY 24Hz sources in Dolby Vision.

Unfortunately, there are no Atmos settings to change, etc. I'm hoping maybe these 2016 models will get some variant of the firmware 2017 owners are getting, whether it includes Atmos stuff or not, that will help the issue.

It's strange that 24Hz seems like a fix for most people, but for me, it's the only setting causing issues instead.

Michael,

Thank you. Thank you. Thank you. I have a Polk Signa S1. Ever since I hooked up Apple TV 4K. It would lose audio all together when I would switch to HDMI 1 for Apple TV 4K.

Then status led lights would flash Green(Dolby) & white (Optical.)

I didn’t know what that meant. After turning off the Dolby Atmos setting.

It now works.

I have vizio p65 UHD dolby vision and the sync is way off on iTunes 4k. the only thing that worked was going into manual settings on apple tv and setting it to 24FPS instead of auto or 60. apple tv can't figure out or can't handle settings higher then that.

We have an LG 65B7A connected via optical cable to a Pioneer VSXLX102 receiver. We have the 4k Apple TV connected directly to the TV via HDMI 3. I've set the receiver at -100ms and I'm still seeing the video ahead of the audio. I have Dolby Vision and Atmos disabled on the TV.

This solved it for us -- disable Dolby ATMOS in the sound settings of your LG TV. The AppleTV 4K doesn't support it (yet) and apparently it's causing a conflict.

Try disabling Dolby Atmos sound in the LG TVs audio setup. This fixed my sync problem and still let me keep Dolby Vision enabled.

Disabling Dolby Atmos did not make much difference for me

I’ve tried every input and every combination but to no avail.

It’s really frustrating.

What does “it’s just works” even mean??? Hopefully with so many having problems they will fix it soon.

Tried that While on the phone with Apple support. Didn’t work.

Yep. Same issue with the LG Oled C7. It’s not a three second delay but it’s enough to drive me crazy.

Today, LG released a firmware update for my OLED65E7P that fixed the audio sync issue. You might want to try installing the new firmware update (04.70.07).

Wow! Well no update showing available for my C7 yet, but that’s encouraging.

Let’s hope so because this is really frustrating.