Lg Sound Sync; Setting Digital Sound Out - LG webOS TV User Manual

HDMI port is not synchronized, set it to PCM.

LG Sound Sync

Sound Additional Settings LG Sound Sync
Connect the LG Sound Sync device to the optical digital input port and set
to Optical.
By setting this feature to On, you can adjust the volume of the connected LG Sound
Sync device using a TV remote control.
If the auto-power feature of the sound bar that supports LG Sound Sync is set to On, the
sound bar will be turned on or off together when the TV is turned on or off.
Setting Digital Sound Out
Sound Additional Settings Digital Sound Out
You can configure the
This setting is only available when
ARC .
Pass Through
When
The codec output with a device may differ from input signals.
PCM
/
Auto Pass Through
Digital Sound Out
is enabled, sound effects may not be output.
Sound Input
All
MPEG
Dolby Digital
Dolby Digital Plus /
Atmos
settings.
Sound Sound Out
Digital Sound Output
PCM
PCM
Dolby Digital
(Optical) Dolby Digital
(HDMI ARC) Dolby Digital Plus /
Atmos
75
Sound Out
is set to Optical / HDMI