Samsung UA40ES6200R E-Manual page 182

N
The USB device must be connected
to your TV before you can select
USB.
N
If you select a source other than TV
or USB, you must:
ΠHave a cable or satellite set-top
box attached to that source
ΠSet the set-top box to the
channel you want to watch when
the TV goes on.
ΠLeave the set-top box turned on.