Samsung 2043SN - Manual (Page 83)

Auto adjustment allows the monitor to self-adjust to the incoming Analog signal. The values
of Fine, Coarse and Position are adjusted automatically.
If auto adjustment does not work properly, press 'AUTO' button again to adjust picture
with more accuracy.
If you change resolution in the control panel, auto function will be executed automatically.
OSD Lock & Unlock
When pressing the AUTO button after locking the OSD
When pressing the MENU button after locking the OSD
Adjusting the Monitor