Lenovo ThinkCentre 3656 Hardware Maintenance Manual page 98

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Hardware Maintenance Manual
6. Carefully 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 88.
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.