Audio Connection; Digital Optical Audio Connection; Speaker Output Setup - LG LT66 Series Owner's Manual

20
MAKING CONNECTIONS
Audio connection
(Only 32/37/42/47LT64**
32/37/42/47LT38** 32/37/42/47LT74**
,
32/37/42/47LT76**)
You may use an optional external audio system
instead of the built-in speaker.
NOTE
If you use an optional external audio device
y y
instead of the built-in speaker, set the TV
speaker feature to off.
Digital optical audio connection
Transmits the digital audio signal from the TV to an
external device. Connect the external device and
the TV with the optical audio cable as shown in the
following illustrations.
SPEAKER
OUT
VOLUME
CONTROL
STEREO
(8 )
(*Not Provided)
Digital Audio System
NOTE
Do not look into the optical output port.
y y
Looking at the laser beam may damage your
vision.
Audio with ACP (Audio Copy Protection)
y y
function may block digital audio output.
32/37/42/47LT66**
, ,
,
OPTICAL
DIGITA T T L
AUDIO OUT
OPTICAL AUDIO IN
Speaker output SETUP
Connect the external speaker to the Speaker
output(STEREO) jack on the TV.
(Only LT64**, LT66**, LT38**, LT74**,
UP
DOWN
SPEAKER
OUT
VOLUME
CONTROL
STEREO
(8 )
(Only LT769*)
UP
DOWN
VOLUME
STEREO
CONTROL
(8 )
Method of Volume control port
Cable
Spec.
GND / Up / Down
LT760*)
Control port for
Speaker out
L -
L+
R+
R -
Control port for
Speaker out
GND
RIGHT
LEFT
GND
Each Up/ Down pin
y y
is pulled to 3.3V
with CPU GPIO.
CPU detects
y y
transition from 3.3V
to GND level for
volume control.