LG L226WU-PF - Manual (Page 12)

A11
You can select the computer that you want to use by
selecting input signal (DVI, D-Sub or USB).
The default input signal is analogue (D-Sub).
Control Panel Functions
MENU Button
Use this button to enter or exit the On Screen Display.
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.
Front Panel Controls
6
SOURCE Button