LG L1553S-SF - Manual (Page 7)

A6
Control Panel Functions
MENU Button
Use this button to enter or exit the On Screen Display.
Control Function
OSD LOCKED/UNLOCKED
This function allows you to lock the current control
settings, so that they cannot be inadvertently changed.
Press and hold the MENU button for several seconds.
The message "OSD LOCKED" should appear.
You can unlock the OSD controls at any time by pushing
the MENU button for several seconds. The message
"OSD UNLOCKED" should appear.
Buttons
Use these buttons to select or adjust functions in the On
Screen Display.
For more information, refer to page A13.
Front Panel Controls Side