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15. Reconnect the heat sink and fan assembly cable to the microprocessor fan connector on the system
board.
16. Reinstall any other parts or reconnect any other cables you removed.
17. Go to “Completing the FRU replacement” on page 103.
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 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 system board.
CAUTION:
The heat sink and microprocessor might be very hot. Turn off the computer and wait
three to ve minutes to let the computer cool before removing the computer cover.
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 this procedure.
To replace the system board:
1. Remove the computer cover. See “Removing the computer cover” on page 73.
2. Place the computer on the right side to make the system board more accessible.
3. Remove any adapter cards installed. See “Replacing an adapter card” on page 87.
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.
84 ThinkCentre Hardware Maintenance Manual