LG 37LB5D Owner's Manual page 256

EXTERNAL EQUIPMENT SETUP
NOTES
Depending on the graphics card, DOS mode may
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not work if a HDMI to DVI Cable is in use.
Check the image on your TV. There may be noise
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associated with the resolution, vertical pattern,
contrast or brightness in PC mode. If noise is
present, change the PC output to another resolu-
tion, change the refresh rate to another rate or
adjust the brightness and contrast on the PIC-
TURE menu until the picture is clear. If the refresh
rate of the PC graphic card can not be changed,
change the PC graphic card or consult the manu-
facturer of the PC graphic card.
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Avoid keeping a fixed image on the screen for a
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long period of time. The fixed image may become
permanently imprinted on the screen.
The synchronization input form for Horizontal and
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Vertical frequencies is separate.