Samsung 151X - Manual (Page 24)

Menu Description
Contrast
You can use the on-screen menus to change the contrast according to
personal preference.
Image Lock
Menu Description Play/Stop
Fine
Removes noise such as horizontal stripes. If the noise
persists even after Fine tuning, repeat it after adjusting the
frequency (clock speed).
Coarse
Removes noise such as vertical stripes. Coarse
adjustment may move the screen image area. You may
relocate it to the center using the Horizontal Control menu.
Position