Samsung UE55KS7500 E-Manual page 86

The problem
The connected device is not
displayed.
The TV audio is not being
played through the receiver.
Check whether the device supports Anynet+.
Check whether the HDMI cable is properly connected.
Go to Anynet+ (HDMI-CEC)
Anynet+ (HDMI-CEC)) and see if
Scan for Anynet+ devices again.
Anynet+ devices must be connected to the TV using an HDMI cable. Make sure
the device is connected to your TV with an HDMI cable. Some HDMI cables may
not support Anynet+.
If the connection is terminated because there has been a power failure or the
HDMI cable has been disconnected, please scan for the device again.
Connect an optical cable to the TV and the receiver.
ARC enables the TV to output digital sound via the HDMI (ARC) port.
However, ARC is only available when the TV is connected to an audio receiver
that supports ARC.
Try this!
( Settings System
Anynet+ (HDMI-CEC)
Expert Settings
has been set to On.