LG DS40Q - Connecting External Devices: Optical Cable; Procedure for optical cable connection to external devices

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Connecting with an Optical Cable
Connect the TV and external device (game console, DVD player, etc.) with an optical cable and enjoy a deep and
rich sound.
Connecting an external device via optical cable
a Use the optical cable to connect the OPTICAL IN terminal on the back of the product to the OPTICAL OUT
terminal of your external device (ex. TV, Blu-ray player) as shown in the picture.
OPTICAL
IN
HDMI ▶ TV
(ARC)
HDMI IN
b Press the Function button repeatedly until the rst from above LED lights up in white among the three
LEDs.