LG UT570H 65" Class 4K UHD HDR SmHospitality LED TV - Manual (Page 20)

12
ENGLISH
External Speakers
VOLUME
CONTROL
+
-
SPEAKER OUT
LINE OUT
AUDIO
LINE OUT
EXTERNAL
SPEAKER OUT
UP
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 pin
is pulled to 3.3 V with
CPU GPIO.
CPU detects transition
from 3.3 V to GND
level for volume
control.
or