Lenovo ThinkCentre E73, Hardware Maintenance Manual

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13. Reconnect all cables that were disconnected from the system board.
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 122.
Replacing the system board
Attention:
Do not open your computer or attempt any repair before reading and understanding “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 82.
3. Lay the computer on its side for easier access to the system board.
4. Remove all memory modules and PCI Express cards that are currently installed. See “Installing or
replacing a memory module” on page 88 and “Installing or replacing a PCI Express card” on page 85.
5. Remove the heat sink and fan assembly from the failing system board. See “Replacing the heat sink and
fan assembly” on page 102.
Note: Do not let the thermal grease on the bottom of the heat sink and fan assembly get in contact
with anything.
6. Record the cable routing and cable connections and then disconnect all cables from the system board.
See “Locating parts on the system board” on page 72.
Chapter 9
.
Replacing FRUs (machine types: 10AS and 10AU)
109