I am going to lose my mind trying to fix this... there is no fix. Only Samsung can fix this. I have swapped out all the HDMI 2.1 cables for new ones—no dice. Forget the audio delay settings... that just makes it worse, as the video is behind the audio by milliseconds—not a big deal if this was a $300 TV and a $90 soundbar.
Support > Self Diagnosis > HDMI Delay > Slow 2
May help a little bit, and is the only setting to slow down video and not audio, which is the latency lip sync issue we are all having wiht the Q90R soundbar. I have it connected directly to the Q900R 8K TV via HDMI 2.1 and the lip sync issue is atrocious. Unacceptable and there is no fix; Samsung make this right or recall this soundbar!
