Samsung SPP4251 Owner's Instructions Manual page 71

Pressthe TV/VIDEO button to select "PC".
Press the MENU button. Press the A or _ button to
seiect "Setup", then press the ENTER button.
Press the A or T button to select "PC", then press
the ENTER button.
Press the A or T button to select 'qmage Lock",
then press the ENTER button.
4 Press the ENTER button to select "Coarse".
Remove picture noise (vertical stripes/on the screen
by pressing the _ or _ button. (If Coarse is not set
properly, vertical stripes wiJJappear on the screen.)
Press the MENU button to exit.
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