LG S90TR - Rear Panel Ports

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a
AC IN
Plug in the power cord.
b
HDMI™ IN
Plug in an HDMI cable to connect an external device to the product.
c HDMI™ d TV (eARC / ARC)
Plug in an HDMI cable to connect the TV to the product.
d
USB port
Plug in a USB storage device to play music with the product.
e
OPTICAL IN
Plug in an optical cable to connect the TV to the product.