LG 19LD350 Owner's Manual page 45

Screen Reset (Reset to original factory values)
Returns Position, Size, and Phase to the default factory settings.
This feature operates only in RGB-PC mode.
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m
x
m
_o
z
m
c
i
m
z
m
c
-0
Select PICTURE.
Select Screen (RGB-PC).
Select Reset.
Select Yes.
4S