LG Flat Panel Monitor User Manual page 7

Control Panel Function
Front Panel Controls
Control Function
Press the hold the MENU button and button for
MENU, Button
3 seconds: the message "CONTROLS LOCKED"
appears.
CO NT R OL S L OC KE D
You can unlock the OSD controls at any time by
pushing the MENU, button for 3 seconds:
the message "CONTROLS UNLOCKED" will
appear.
CO NT RO L S UN L OC KE D
A7