LG 42LH200C - 42In Lcd Hdtv 1080P 1366X768 1200:1 Blk Hdmi Vga Svid Usb Spkr Owner's Manual page 35

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.
m
x
m
_o
z
m
c
m
z
m
c
-0
Select PICTURE.
Select Screen (RGB-PC).
Select Reset.
Select Yes.
3S