Speaker Output Setup; Volume Control Port; External Speaker Out - LG LT65 Series Owner's Manual

Speaker output setup

Connect the external speaker to the Speaker
output(STEREO) jack on the TV.
(Only LT64**, LT65**, LT76**, LS64**)
UP
DOWN
SPEAKER
OUT
VOLUME
CONTROL
STEREO
(8 )
(Only LT74**)
UP
DOWN
SPEAKER
OUT
VOLUME
CONTROL
STEREO
(8 )
Control port for
Speaker out
L -
L+
R+
R -
Control port for
Speaker out
GND
RIGHT
LEFT
GND

Volume control port

Cable
Spec.
GND / Up / Down
y Each Up/ Down pin is pulled to 3.3V with CPU
GPIO.
CPU detects that vol. crtl. Port is shorted to
y
GND for volume control. (Only LT64**, LT65**,
LT76**, LS64**)
y CPU detects transition from 3.3V to GND level
for volume control.
NOTE
y External speaker must be used four
plug(BTL: Bridge Tied Load, Stereo) as
shown in the drawings and external speaker
fully inserted with external Speaker Jack.
(Only LT64**, LT65**, LT76**, LS64**)
y External speaker must be used three plug
(SE : Single Ended, Stereo) as shown in
the drawings and external speaker fully
inserted with external Speaker Jack.
LT74**)
y Otherwise it will cause defact.

External speaker out

(Only LS34**)
Connecting External Speaker.
EXTERNAL
SPEAKER OUT
NOTE
y Make sure when connecting External
Speaker that TV is Power OFF.
25
REMOTE CONTROL
(Only
L -
L+
R+
R-