Samsung PN51E6500EFXZA - Manual (Page 624)

RF (Cable / Antenna) Connection (Troubleshooting)
The TV is not receiving all channels.
Make sure the coaxial cable is
connected securely.
Run Auto Program to add available
channels to the channel list. Go to
Channel
→
Auto Program then select
Cable and make sure to select the
correct Cable TV signal type. There are
3 options, STD , HRC and IRC . Most
cable systems use STD . If you are