Samsung UA40ES7 E-Manual page 675

ΠIf your TV connected with a cable /
set-top box, reconnect the AC cord
and wait until the cable / set-top box
reboots.
ΠSet the output resolution of the cable
box to 1080i or 720p.
Sound Quality
First of all, please perform the
Test
properly operating. (Go to
to confirm that your TV audio is
Sound
→
Menu