Lenovo 7812, Hardware Maintenance Manual

Page: 140 / 224

Types 7818, 7819, 9688, 9689, 9690, and 9691
Important
The heat sink and microprocessor might be very hot. Make sure these
components are cool enough to safely handle before continuing this
procedure.
Note: When replacing the system board you must also order a new retention
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 123.
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.
5.
Press the release tab
1
down, slide the hard drive cage
2
back, and pivot
the hard disk drive outward as shown.
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 “Locating parts on the system board” on page 125.
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.
10. Disconnect the heat sink and fan assembly cable from the system board. See
the system board illustration for your machine type at “Locating parts on the
system board” on page 125.
11. Remove the four screws
1
securing the heat sink and fan assembly to the
system board.
134
Hardware Maintenance Manual