First you have to make sure that cable is connected and if you are not the original owner that the prior owner did not mess with the cable...cable (Diagrams above so I won't repost).
Then, There are cable systems, cable systems and cable systems.. NOT all Televisions can scan one of those systems Element TV's for example can only scan NTSC analog and ATSC digital, on QAM detector in the unit (most cable systems are QAM) and to make matters worse SOME cable systems are encrypted, Your Television can not receive them.
The one I'm on is ATSC/NTSC digital/analog mixed, they do not change the signals they get OTA they just pass 'em on.. Very rare.
