LG DU-52SZ51D Owner's Manual page 24

11. Screen 11: Cable Box Tuned to Channel 9?
•If you select Yes, you see Screen 12.
•If you select No, a different code is tested in Screen 10.
NOTE:
•Many Cable Boxes require testing more than one code.
•If you select Test this code again, the same code is tested again in
Screen 10.
24 DLP Projection TV
Installation
Owner's Manual 24