Replacing The System Board - Lenovo 2119 Maintenance Manual

What to do next:
• To work with another piece of hardware, go to the appropriate section.
• To complete the replacement, go to "Completing the parts replacement" on page 150.

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 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 94.
3. Lay the computer on its side for easier access to the system board.
4. Remove the hard disk drive from the chassis. See "Replacing the primary hard disk drive" on page 124.
5. Remove the power supply assembly from the chassis. See "Replacing the power supply assembly" on
page 107.
6. Remove all memory modules and PCI cards that are currently installed. See "Installing or replacing a
memory module" on page 98 and "Installing or replacing a PCI card" on page 95.
7. 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 75.
8. Remove the heat sink and fan assembly from the failing system board. See "Replacing the heat sink and
fan assembly" on page 109.
9. Remove the eight screws that secure the system board to the chassis by following the sequence shown
in the following illustration.
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ThinkCentre Hardware Maintenance Manual