Lenovo ThinkCentre Edge 71 Hardware Maintenance Manual (HMM) (May 2012) - Thin - Page 138

Lower the optical drive bay assembly.

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8. Remove the six screws that secure the system board. Figure 69. Removing the six screws that secure the system board 9. Lift the system board out of the chassis. 10. Remove the microprocessor from the failing system board and install it on the new system board. See "Replacing the microprocessor" on page 130. 11. Install the new system board into the chassis by aligning the six mounting studs in the chassis with the corresponding holes in the new system board. Then, install the six screws to secure the system board. 12. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new system board. See "Replacing the heat sink and fan assembly" on page 127. 13. Install all memory modules and PCI cards removed from the failing system board on the new system board. See "Installing or replacing a memory module" on page 115 and "Installing or replacing a PCI card" on page 113. 14. Reconnect all remaining cables to the system board. See "Locating parts on the system board" on page 107. 15. Lower the optical drive bay assembly. 16. To complete the replacement, go to "Completing the parts replacement" on page 139. The failing system board must be returned with a microprocessor socket cover to protect the pins during shipping and handling. To install the microprocessor socket cover, do the following: 1. Release the lever securing the microprocessor retainer and open the retainer to access the microprocessor. 134 ThinkCentre Hardware Maintenance Manual

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8. Remove the six screws that secure the system board.
Figure 69. Removing the six screws that secure the system board
9. Lift the system board out of the chassis.
10. Remove the microprocessor from the failing system board and install it on the new system board. See
“Replacing the microprocessor” on page 130.
11. Install the new system board into the chassis by aligning the six mounting studs in the chassis with the
corresponding holes in the new system board. Then, install the six screws to secure the system board.
12. Install the heat sink and fan assembly and connect the heat sink and fan assembly cable to the new
system board. See “Replacing the heat sink and fan assembly” on page 127.
13. Install all memory modules and PCI cards removed from the failing system board on the new system
board. See “Installing or replacing a memory module” on page 115 and “Installing or replacing a PCI
card” on page 113.
14. Reconnect all remaining cables to the system board. See “Locating parts on the system board” on
page 107.
15. Lower the optical drive bay assembly.
16. To complete the replacement, go to “Completing the parts replacement” on page 139.
The failing system board must be returned with a microprocessor socket cover to protect the pins during
shipping and handling.
To install the microprocessor socket cover, do the following:
1. Release the lever securing the microprocessor retainer and open the retainer to access the
microprocessor.
134
ThinkCentre Hardware Maintenance Manual