Lenovo 10155, Maintenance Manual, Page: 91 / 120

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 69.
3. Lay the computer on its side for easier access to the system board.
4. Remove all memory modules and PCI cards that are currently installed. See “Installing or replacing a
memory module” on page 75 and “Installing or replacing a PCI card” on page 71.
5. Carefully take note of the locations of all cable connections on the system board and disconnect all
the cables. See “Locating parts on the system board” on page 65.
6. Remove the heat sink and fan assembly from the failing system board. See “Replacing the heat sink and
fan assembly” on page 79.
7. Remove the eight screws that secure the system board.
Figure 23. Removing the eight screws that secure the system board
8. Carefully slide the system board so that it can be released from the mounting studs that secure the
system board in place.
9. Lift the system board out of the chassis.
Chapter 8
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Replacing FRUs
85