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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 information on how to remove and replace the system board.
To remove or replace the system board, do the following:
1. Remove the cover. See "Removing the cover" on page 94.
2. Lift the fan duct off the heat sink fan.
3. Remove any PCI adapter cards installed in the PCI connectors.
4. You might have to remove the drive bay assembly to access the system board. See "Accessing system
board components and drives" on page 96.
5. 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 95.
6. Remove the hard disk drive. See "Replacing the hard disk drive" on page 106.
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.
11.Lift the heat sink and fan assembly off the failing system board. Place the heat sink on its side so that the
thermal grease does not come in contact with anything.
Note: You might have to gently twist the heat sink to free it from the microprocessor.
12.Remove the retention module from the rear of the failing system board and install it in the same position
on the new system board.
Chapter 9 Replacing FRUs (Types 7057, 7062, 7092, 9342, 9344, 9354, 9426, 9486, 9624, 9707, 9787, 9804, 9945) 101