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:

1.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.

2.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.

3.Remove the computer cover. See “Removing the computer cover” on page 15.

4.Locate the ambient light sensor in the computer. See “Component locations” on page 11.

5.Carefully remove the two screws sensor out of the computer.

1

that secure the ambient light sensor and then lift the ambient light

Figure 29. Removing the ambient light sensor

6.Disconnect the ambient light sensor cable from the system board.

7.Align the screw holes in the new ambient light sensor with the corresponding holes in the computer and then install the two screws to secure the ambient light sensor.

8.Connect the new ambient light sensor cable to the system board. See “System board part and connector locations” on page 12.

What to do next:

•To work with another piece of hardware, go to the appropriate section.

•To complete the installation or replacement, go to “Completing the parts replacement” on page 52.

38ThinkCentre User Guide

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Lenovo 852, 3091, 3265, 4285, 870, 800, 5205, 5248, 3678, 3650, 3429, 3373, 2557, 2471 manual Removing the ambient light sensor
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