Lenovo ThinkCentre M77 1990 User Manual page 62

4. Locate the system board and disconnect all cables connected to the system board. See "Locating
parts on the system board" on page 11.
5. Remove the heat sink and fan assembly. See "Replacing the heat sink and fan assembly" on page 47.
Note: Place the heat sink and fan assembly on its side so that the thermal grease on the bottom of it
does not get in contact with anything.
6. Lift the small handle
Figure 33. Accessing the microprocessor
7. Lift the microprocessor straight up and out of the microprocessor socket.
Figure 34. Removing the microprocessor
Notes:
a. Your microprocessor and socket might look different from the one illustrated.
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ThinkCentre User Guide
1 to release the microprocessor 2 secured on the system board.