Samsung PN51E6500EFXZA - Manual (Page 598)

the source is a digital component
such as a DVD player and it is
connected to the TV via HDMI, you
will hear only 2 channel sound from
the receiver.
Using the ARC function
for LED 6100 ― 7150 Series and PDP TV
You can listen to sound from the TV
through a receiver connected using
an HDMI cable without connecting
a separate optical cable. To listen to