Replacing the ambient light sensor - ThinkCentre M90z
This section provides instructions on how to replace the ambient light sensor.
Note: The ambient light sensor is available only in some models.
To replace the ambient light sensor, do the following:
Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect all power cords from electrical outlets and disconnect all cables that are connected to the computer.
Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay it down so that the screen is against the surface and the cover is facing up.