Samsung 8000 Series User Manual page 557

The connected device is not displayed.
Check whether or not the device supports
Anynet+ functions.
Check whether or not the HDMI cable is
properly connected.
Check whether Anynet+ (HDMI-CEC) is set to
On. (System Anynet+ (HDMI-CEC))
→
Search Anynet+ devices again.
Anynet+ requires an HDMI connection. Make
sure the device is connected to your TV with
an HDMI cable.
Some HDMI cables may not support Anynet+