If the external sound system has an ARC-enabled HDMI cable, this is the preferred connection type. The advantage of using a HDMI-ARC cable is that only a single cable is needed to connect the TV to the sound system.
If there is no sound coming from the external speaker system after connecting the cable and restarting both systems, please check EasyLink system on TV.
● Press the “HOME” button and select:
[Setup]> [TV settings]> [General settings]> [EasyLink]> [EasyLink]> [On]
Or
[Setup]> [TV settings]> [Sound]> [Advanced]> [HDMI ARC]> [On]
Select [Autostart Easy Link] or [EasyLink]. The setting “EasyLink autostart” will cause the TV to switch to external speakers whenever the sound system is enabled.
If the external sound system does not support ARC, the HDMI-ARC cable needs to be connected to an “Input” port on the external sound system. Please refer to the manual of the external sound system for instructions how to do this. Note that if the external sound system is capable of sending video to the TV, a second HDMI cable is required to connect the “output” of the external sound system.