LG US670H Pro:Centric 4K HDR SmLED Hospitality TV (43") - Manuel (Page 20)

12
ENGLISH
External Speakers
(Depending upon model)
VOLUME
CONTROL
+
-
SPEAKER OUT
LINE OUT
AUDIO
LINE OUT
EXTERNAL
SPEAKER OUT
UP
or
DOWN
Control port for Speaker out
RIGHT
LEFT
GND
GND
or
: Depending upon model
• Use only with the 3 pole 3.5 mm stereo jack.
• Do not connect your headphones or earphones to
the port for connecting an external speaker.
Method of volume control port
(Depending upon model)
• Cable Spec.
VOLUME CONTROL
+
-
GND / UP / DOWN
Each up/down pins
are connected to CPU
with pull up resistor
respectively.
CPU detects transition
from 3.3 V to GND
level for volume
control.