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OSD Lock Settings You have the option of using the OSD Lock feature to prevent current image adjustments from being changed. • OSD Lock: Press and hold  and [J] for 10 seconds. If any buttons are pressed the message OSD Locked will display for 5 seconds. • OSD Unlock: Press and hold  and [J] again for 10 seconds.
Here's the link for the product support page;
Click "User Manuals" on the left.
or here is a direct link;
Check page 28:
"The Main Menu displays OSD MAIN MENU LOCKED . Pressing the front control panels hasno
effect. How can I unlock this function?
Press and hold the OSD menu key for about 10 seconds until picture displays "OSD MAIN MENU
Hope this helps :)