5.Remove the four screws 1 that secure the heat sink and fan assembly to the system board.

Note: Carefully remove the four screws from the system board to avoid any possible damage to the system board. The four screws cannot be removed from the heat sink and fan assembly.

Figure 20. Removing the heat sink and fan assembly

6.Lift the failing heat sink and fan assembly off the system board.

Notes:

a.You might have to gently twist the heat sink and fan assembly to free it from the microprocessor.

b.Do not touch the thermal grease while handling the heat sink and fan assembly.

7.Position the new heat sink and fan assembly on the system board so that the four screws are aligned with the holes on the system board.

Note: Position the new heat sink and fan assembly so that the heat sink and fan assembly cable is toward the microprocessor fan connector on the system board.

8.Alternate tightening each screw a small and equal amount until the heat sink and fan assembly is secured to the system board. Do not over-tighten the screws.

9.Connect the heat sink and fan assembly cable to the microprocessor fan connector on the system board.

10.Go to “Completing the parts replacement” on page 45.

Chapter 2. Installing options and replacing hardware 29

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Lenovo 7258, 3063, 3285, 6138, 7347, 7639, 8854, 9728, 8494, 75717628, 7635, 7373, 7484, 7255 Removing the heat sink and fan assembly

7188, 6209, 7635, 7258, 7373 specifications

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