Samsung PN51E6500EFXZA - Manual (Page 46)

the signal source the TV is tuned to.
For example, if you receive your TV
signal over the air, and you select
Cable , you will see only snow. You
must select Air to see a picture.
Auto Program
Menu
→
Channel
→
Auto Program
The Auto Program function memorizes
all channels that are available over the
air or through your cable system and
adds them to the Channel list.