Lenovo ThinkCentre M90z Hardware Maintenance Manual for ThinkCentre M90z - Page 97

8. Connect the new multi-touch board cables to the system board and the multi-touch screen. See "System board connectors" on page 70. 9. Go to "Completing the parts replacement" on page 110. Replacing the ambient light sensor Attention Do not open your computer or attempt any repair before reading and understanding the "Important safety information" in the ThinkCentre Safety and Warranty Guide that came with your computer. To obtain a copy of the ThinkCentre Safety and Warranty Guide, go to:http://www.lenovo.com/support 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 71. 4. Locate the ambient light sensor in the computer. See "FRU locations" on page 69. 5. Carefully remove the two screws 1 that secure the ambient light sensor and then lift the ambient light sensor out of the computer. 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. Chapter 8. Replacing FRUs 91