You have to select a proper input, other than 'cable box'. There should be no other problem. it should work as normal TV. But, if you wish to select an other input, you should first release the Hotel mode, and set the TV to normal mode. If you have to make this selection, you might have to enter its service mode. This procedure might need some practical experience. So, contact any experienced service technician in this case.
If you wish to get some details; check the site linked here. Pull up older posts.
http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
NB: Please read and understand well, the instructions to enter the service mode, before you begin. Be very careful. Note how to "EXIT" the service mode; after entering and adjusting data. This is very important.
Search the site by type in the "brand name" to your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.