Lenovo H430 Desktop - Manual (Page 51)

Chapter 9. Replacing hardware
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5. Remove the 4 screws that secure the heatsink assembly to the system
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”.