Enter into its service mode, and check whether external commands have been locked. If locked. open it. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Even though it is locked to external commands, codes to use [service mode entry procedure] should work. If it too so not work, check and replace the infra-red sensor inside the TV. Contact any service technician.
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.
SOURCE: can't use my remote control
you have to do it manually on the t.v. using the menu, channel.volume, and input buttons on the side of the T.V.
6) Anti-Tamper setting (locking the Remote Control) This setting will prohibit the use of the operation mode, temperature adjustment, air-flow and auto-louver settings*.
a) In normal operation mode, press and hold the "r UP and Down buttons for more than 3 seconds"
b) "OPER. LOCK" will appear on the remote control display.
Repeat to unlock.
Thanks for choosing FixYa,
Kelly
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