Replacing The System Board - Lenovo ThinkCentre Edge 91 Hardware Maintenance Manual

10. Lower the new microprocessor straight down into the microprocessor socket on the system board.
Figure 27. Installing the microprocessor
11. Close the microprocessor retainer and lock it into position with the small handle to secure the new
microprocessor in the socket.
12. Reinstall the heat sink and fan assembly. See "Replacing the heat sink and fan assembly" on page 94.
13. Reconnect all cables that were disconnected from the system board.
14. To complete the installation or replacement, go to "Completing the parts replacement" on page 104.

Replacing the system board

Attention:
Do not open your computer or attempt any repair before reading and understanding the "Important safety information"
in the ThinkCentre User Guide. To obtain a copy of the ThinkCentre User Guide, go to:
http://www.lenovo.com/ThinkCentreUserGuides
This section provides instructions on how to replace the system board.
CAUTION:
The heat sink and microprocessor might be very hot. Turn off the computer and wait three to five
minutes to let the computer cool before removing the computer cover.
To replace the system board, 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. Remove the computer cover. See "Removing the computer cover" on page 79.
3. Lay the computer on its side for easier access to the system board.
4. Remove the hard disk drive from the chassis. See "Replacing the primary hard disk drive" on page 88.
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ThinkCentre Hardware Maintenance Manual