Phillips TV 20D502-00BB limited channels?

Just received a surplus tv from hospital. It works ok, has a good picture and sound. Problem is my cable plugs right in and i get espn2, msnbc, fox local, and maybe 4 or 5 other channels only. Is there something blocking access to the remaining cable stations or is this tv just made to receive alimited number of channels? It has a sony remote that works ok. The set, when i received it, had been unplugged for over 10 hours. Yr 1993. Model no.KJ9320 A402. Chassis model no. 20D502-OOBB. Any input is much appreciated. My email C_Melin@msn.com