LG 49US761H0GA.AFFD Owner's Manual page 11

External Speakers
(Depending on model)
EXTERNAL
SPEAKER OUT
or
STEREO
(8 )
VOLUME
CONTROL
Control port for Speaker out
+
-
DOWN
RIGHT
LEFT
: Depending on 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 on model)
• Cable Spec.
UP
Each up/down pins
are connected to CPU
with pull up resistor
respectively.
/ UP / DOWN
CPU detects
transition from 3.3 V
to level for
volume control.
11