For everyone having lip sync issues, I have discovered if you use the HDMI 1 (ARC) input there is a delay added to the video on the TV. This is if you are trying to connect a soundbar to the set in which case the video is delayed to help keep it in sync with the soundbar. If you use HDMI 2 the problem disappears.
Hope this helps alot of you with the lip sync issue. Mine was an immediate positive difference!