Samsung 7 series User Manual page 8

! DIGITAL AUDIO OUT (OPTICAL)
- Connects a set of external headphones for private listening.
When the HDMI IN jacks are connected, the DIGITAL AUDIO OUT (OPTICAL) jack on the TV outputs 2 channel
➣
audio only. If you want to hear 5.1 channel audio, connect the Optical jack on the DVD player or Cable/Satellite Box
directly to an Amplifier or Home Theater, not the TV.
@ EXT , EXT 
Connector
EXT 1
EXT 2
- Inputs or outputs for external devices, such as VCR, DVD, video game device or video disc players.
# KENSINGTON LOCK (depending on the model)
- The Kensington Lock (optional) is a device used to physically fix the system when used in a public place.
- If you want to use a locking device, contact the dealer where you purchased the TV.
- The location of the Kensington Lock may be different depending on its model.
Input
Video Audio (L/R)
O O
O O
RGB
O Only TV or DTV output is available.
English - 
Output
Video + Audio (L/R)
Output you can choose.