This has an Optical audio out. The following are the input/outputs on this TV:
RF In (Antenna/Cable) 1 (rear)
AV In 1 (rear)
Component Video In (Y, Pb, Pr + Audio) 1 (rear)
HDMI™/HDCP In 2 (1 rear, 1 side)
USB 3.0/2.0 In 1 (side)
Digital Audio Out (Optical) 1 (rear)
RS-232C (Control & Service) 1 via 3.5mm mini jack (rear)
This TV has a TOSLINK optical audio connector. Connecting to an audio system. This is a Fiber Optic sound cable. Not included.
(For LN5100, LN5200, LN530B, LN5300, LN5310, LN5400 series)
You can use an optional external audio system instead of the built-in speaker.
Digital optical audio connection Page 24 LN5100 Manual link http://content.abt.com/documents/51300/47LN5200_manual.pdf
There is an optical connection on the rear of the TV.