LOCK and UNLOCK LG Monitor

Try this:
Hold the MENU button for 5 seconds, the 'OSD LOCKED' will appear, to unlock, hold MENU button for 5 seconds, the 'OSD UNLOCKED' will appear. It may not work on ALL LG LCD panels.

http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

Hold the MENU button for 5 seconds, the 'OSD LOCKED' will appear, to unlock, hold MENU button for 5 seconds, the 'OSD UNLOCKED' will appear. It may not work on ALL LG LCD panels.
Please post back, otherwise check the owner manual.

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums
http://en.wikipedia.org/wiki/Capacitor_plague

Hold the MENU button for ten seconds to unlock or lock the OSD.

This information is from your manual for the L194WT:
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.


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Here is the user manual: http://safemanuals.com/user-guide-instructions-owner-manual/LG/L1915S-_E

Page 8: HOLD THE MENU BUTTON FOR 5 SECONDS, THE 'OSD LOCKED' WILL APPEAR. TO UNLOCK, HOLD THE MENU BUTTON FOR 5 SECONDS, THE 'OSD UNLOCKED' WILL APPEAR.

Option 1: OSD lock - all 4 buttons are locked except the "POWER"
button. Press and hold the "MENU" and ">" buttons for 3
seconds to lock the buttons. Repeat this step to unlock.

Option 2: OSD & Power button lock - all 5 buttons including the
"POWER" button are locked. Press and hold the "MENU"
and "<" buttons for 3 seconds to lock all 5 buttons. Repeat
this step to unlock.