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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
Note: When replacing the system board you must also order a new retention module for the new system
board. Make sure you have a retention module for the new system board before continuing with this
procedure.
This section provides instructions on how to remove and install the system board.
To replace the system board, do the following:
1. Remove the side cover. See "Removing the cover" on page 68.
2. Place the computer on its right side to help make the system board more accessible.
3. Remove any PCI adapter cards installed. "Replacing a PCI adapter card" on page 80
4. Disconnect the signal and power cables from the hard disk drive.
5. Press the release tab 1 down, slide the hard drive cage 2 back, and pivot the hard disk drive outward
as shown.
6. Carefully take note of the location of all cable connections on the system board and disconnect all cables.
See "Locating parts on the system board" on page 71
.
7. Remove the screws that secure the system board to the chassis.
8. Lift the system board out of the chassis.
9. Remove the memory modules from the failing system board and install them in the same location on
the new system board.
10.Rotate handle 1 to release the heat sink clamp and then disengage the clamp from the plastic retention
bracket.
74 ThinkCentre Hardware Maintenance Manual