Lenovo 3496, 3493DFU manual Removing the heat sink and fan assembly

6.Follow this sequence to remove the four screws that secure the heat sink and fan assembly to the system board:

a.Partially remove screw

b.Partially remove screw

1 , then fully remove screw

3 , then fully remove screw

2 , and then fully remove screw

4 , and then fully remove screw

1.

3.

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 35. Removing the heat sink and fan assembly

7.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.When handling the heat sink and fan assembly, do not touch the thermal grease on the bottom of the heat sink and fan assembly.

8.Place the new heat sink and fan assembly on the system board so that the four screws are aligned with the corresponding holes in 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.

9.Follow the following sequence to install the four screws to secure the new heat sink and fan assembly. Do not over-tighten the screws.

a.Partially tighten screw

b.Partially tighten screw

1 , then fully tighten screw

3 , then fully tighten screw

2 , and then fully tighten screw

4 , and then fully tighten screw

1.

3.

10.Connect the new heat sink and fan assembly cable to the microprocessor fan connector on the system board. See “Locating parts on the system board” on page 12.

11.Lower and position the heat sink fan duct on the top of the heat sink and fan assembly until it snaps into position.

Chapter 5. Installing or replacing hardware 51