Lenovo 7099U1U, Hardware Maintenance Manual

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Figure 64. Connecting a SATA optical drive
12. To complete the replacement, go to “Completing the parts replacement” on page 132.
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 five minutes to let the computer cool before opening the computer cover.
To replace the system board:
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 101.
3. Remove the front bezel. See “Removing and reinstalling the front bezel” on page 102.
4. Lay the computer on its side for easier access to the system board. Pivot the drive bay assembly upward
to gain access to the system board. See “Accessing the system board components and drives” on
page 104.
5. Disconnect the front audio and USB assembly cables from the system board. See “Locating parts on the
system board” on page 99.
6. Remove all memory modules and PCI cards that are currently installed. See “Installing or replacing a
memory module” on page 107 and “Installing or replacing a PCI card” on page 105.
7. Remove the heat sink and fan assembly from the failing system board. See “Replacing the heat sink and
fan assembly” on page 110.
8. 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 99.
9. Remove the six screws that secure the system board.
Chapter 9
.
Replacing FRUs (Machine Types: 0889, 5023, and 7844.)
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