Replacing The System Board - Lenovo ThinkCentre M72e Hardware Maintenance Manual

14. To complete the installation or replacement, go to "Completing the parts replacement" on page 156.

Replacing the system board

Attention:
Do not open your computer or attempt any repair before reading and understanding the "Important safety information"
on page 1.
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 opening 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 120.
3. Remove the front bezel. See "Removing and reinstalling the front bezel" on page 120.
4. Pivot the optical drive bay assembly upward to gain access to the system board. See "Accessing the
system board components and drives" on page 121.
5. Remove all memory modules and PCI cards that are currently installed. See "Installing or replacing a
memory module" on page 123 and "Installing or replacing a PCI card" on page 124.
6. Remove the heat sink and fan assembly from the failing system board. See "Replacing the heat sink and
fan assembly" on page 132.
7. Carefully take note of the location of all cable connections on the system board and disconnect all the
cables. See "Locating parts on the system board" on page 80.
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ThinkCentre Hardware Maintenance Manual