Samsung SyncMaster 551s Owner's Manual page 29

On Screen Display (OSD) Menu System
Menu How to adjust
Parallelogram
Adjust the parallelogram setting when the display is leaning
left or right.
With the menu off, push the menu
Push the - button or + button until the Geometry
screen is displayed.
Push the menu
the Parallelogram screen appears.
Push the menu
adjustment screen.
Use the - button or + button to adjust the parallel setting.
button.
button again and then press the - or + button until
button to open the Parallelogram
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User's Manual