Replacing The System Board - Lenovo ThinkCentre 7258 User Manual

Replacing 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.
Note: When replacing the system board a new retention module for the
This section provides instructions on how to remove and replace the system board.
The procedure varies depending upon the machine type.
10. Remove the microprocessor from the failing system board and install it on the
11. The failing system board must be returned with a microprocessor socket cover
90
Hardware Maintenance Manual
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
microprocessor heat sink is required. Make sure you have a new retention
module before beginning this procedure.
1. Remove the cover. See "Removing the computer cover" on page 85.
2. Place the computer on its right side to help make the system board more
accessible.
3. Remove any adapter cards installed in the PCI connectors.
4. Disconnect the signal and power cables from the hard disk drive and remove
the hard disk drive out of the chassis. See "Replacing the primary hard disk
drive" on page 102.
5. Disconnect the heat sink and fan assembly cable from the system board. And
lift the heat sink and fan assembly off the failing system board. See the system
board illustration for your machine type at "System board connectors" on
page 84.
6. Carefully take note of the location of all cable connections on the system
board and disconnect all cables. See the system board illustration for your
machine type at "System board connectors" on page 84.
7. Remove the screws that secure the system board to the chassis.
8. Carefully remove the failing system board out of the chassis.
9. Remove the microprocessor socket cover from the new system board.
new system board. See "Replacing the microprocessor" on page 94.
to protect the pins during shipping and handling. Install the microprocessor
socket cover removed from the new system board on the failing system board.
To install the microprocessor socket cover:
a. Make sure the microprocessor has been removed from the microprocessor
socket, and then close the microprocessor retainer and lock it into position
with the small handle.
b. Insert the tabs 1 of the socket cover into the hinged side of the socket,
and then press the other side of the socket cover downward until the tabs
2 snap into position.