LG 55LH400C Owner's Manual page 36

EXTERNALEQUIPMENT SETUP
Screen Setup for PC mode
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Selecting Resolution
You can choose the resolution in RGB-PC mode.
The Position, Phase, and Size can also be adjusted.
You can use this function only when the PC resolution is set to 1024X768, 1280X768 or 1360X768.
Select PICTURE.
Select Screen (RGB-PC).
Select Resolution.
Select the desired resolution.
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