Samsung 8000 Series User Manual page 558

functions.
If the connection is terminated because
there has been a power failure or the HDMI
cable has been disconnected, please repeat
the device scan.
The TV sound is not output through the receiver.
Connect the optical cable between TV and
the receiver.
The ARC function enables digital output
of sound using the HDMI IN 2(ARC) port
and can only be operated when the TV
is connected to an audio receiver that
supports the ARC function.