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Screen Resolution Incorrect After LCD Screen Replacement | Duplicated desktops

Incorrect screen resolution after LCD screen replacement

After replacing your laptop screen, you may find that the screen resolution does not appear correct. The screen maybe stretched so that some parts of the display are out of the range of the physical glass, or you may find the desktop is shrunk and duplicated across the screen.

The problem in detail

Causes

This problem would on first inspection indicate a faulty or incompatible replacement laptop screen, however this is not always the case. Often overlooked is the Windows Screen Driver. This is not the laptops video driver package/display drivers, however this is a specific driver for the display you are using. Usually Windows will use the standard PNP display driver, however often a specific driver file is needed for your replacement LCD display. 

Solution

The file you need to create is known as a custom EDID for the monitor (custom INF file); you will need to extract the settings from your old .INF file, we recommend doing this with the old screen attached, the registry settings of my old LCD panel (Samsung, LG, AUO) can be extracted and added to the new INF file created when the new screen is fitted. Otherwise, if you do not have the old screen or the old settings, you will need to know the exact monitor setting for the new panel you are adding.
INF files are stored in the folder C:\WINDOWS\INF
You can find out which current INF file your old screen and replacement are using by opening the Control Panel, Display Settings, Going to the Settings tab and choosing Advanced.
The Inf file in C:\Windows\INF can be edited with Notepad.
Instructions for creating a custom .INF file can be found here.

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