To set AV Sync
HOMEHOME Settings Sound AV Sync Adjustment
Synchronizes unmatched video and audio.
Select AV Sync Adjustment to On to synchronize audio output (TV speaker or External Speaker) with the video.
If you select the Bypass, Outputs the broadcast signals or the sound from external devices without any audio delay. The audio may be output before the video because of the time the TV takes to process the video input.