Samsung UN46ES7500F E-Manual page 575

connected to your TV.
The picture is good but there is no sound.
Set the Speaker Select option to TV
Speaker in the Sound menu.
If you are using an external device,
check the device's audio output option.
(Ex. You may need to change your
cable box's audio option to HDMI if
you have the box connected to your TV
using an HDMI cable.)
If you are using a DVI to HDMI cable, a