LG 47LA790V Service Manual page 58

LINE OUT
Line out is used when you want to send the TV audio signal to an external device. It works like headphone.
The signal out or line out remains at a constant level, regardless of the current setting of the volume control.
What is the difference between headphones and line out headphone adjusts the volume on the television whereas, line out adjust
the volume on the external devices such as amp or receiver.
Line-out is a two-channel stereo output and you need a cable to connect an external speaker.
H13 provides headphone and external speaker output through an output phone jack.
To set the line out, you choose Sound Option Setting in setting menu - sound and change Headphone to External
Speaker (Audio Out) in Analogue out, then choose External Speaker (Audio Out) in sound out.
Copyright © 2013 LG Electronics. Inc. All rights reserved.
Only for training and service purposes
Headphone
6 / 90
External Speaker
2CH stereo
LGE Internal Use Only