Samsung 245T-BLACK User Guide - Page 39

When pressing the AUTO or PIP button after locking the OSD When pressing the MENU button after locking the OSD Menu Description This is the function that locks the OSD in order to keep the current states of settings or prevent others from adjusting the current settings. Lock : Hold down the menu button for more than five (5) seconds to activate the OSD adjustment lock function. Locked Unlock : Hold down the menu button for more than five (5) seconds to deactivate the OSD adjustment lock function. Though the OSD adjustment lock function is activated, you can still adjust the brightness and contrast, and adjust MagicBright ( ) using the Direct button.