Lenovo H405 Hardware Maintenance Manual page 51

5. Remove the 4 screws
board.
6. Lift the defective heatsink assembly away from the system board.
7. Use a thermal grease syringe to place five drops of grease on the top of
the microprocessor. Each drop of grease should be 0.03ml (3 tick marks
on the grease syringe).
8. Fit the new heatsink assembly back onto the heatsink retention bracket.
9. Reconnect the disconnected cables to the system board.
10. Refer to "Completing the installation".
Chapter 9. Replacing hardware
that secure the heatsink assembly to the system
49