Replacing The System Board - Lenovo ThinkCentre 3656 Hardware Maintenance 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 you must also order a new retention
This section provides information on how to remove and replace the system board.
To remove or replace the system board, do the following:
126
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
module for the new system board. Make sure you have a retention module
for the new system board before continuing with this procedure.
1. Remove the cover. See "Removing the cover" on page 117.
2. Lift the fan duct off the heat sink fan.
3. Remove any PCI adapter cards installed in the PCI connectors.
4. You might have to remove the drive bay assembly to access the system board.
See "Accessing system board components and drives" on page 119.
5. Take note of the location of all cable connections on the system board and
disconnect all cables. See "Locating parts on the system board" on page 119.
6. Remove the hard disk drive. See "Replacing the hard disk drive" on page 133.
7. Remove the screws that secure the system board to the chassis.
8. Lift the system board out of the chassis.
9. Remove the memory modules from the failing system board and install them
in the same location on the new system board.