Samsung UA40ES7 E-Manual page 666

N
To use the ARC function, a receiver
which supports the HDMI-CEC and
ARC features must be connected to
the HDMI IN 2 (ARC) port.
N
To disable the ARC function,
set the
the TV transmits the ARC signal
continuously, the receiver will be
blocked from receiving the signal.
Receiver to Off. Even if