Lenovo ThinkCentre M93z Hardware Maintenance Manual page 116

1. Remove all media from the drives and turn off all attached devices and the computer. Then, disconnect
all power cords from electrical outlets and disconnect all cables that are connected to the computer.
2. Place a soft, clean towel or cloth on the desk or surface. Hold the sides of your computer and gently lay
it down so that the screen is against the surface and the cover is facing up.
3. Remove the computer cover. See "Removing the computer cover" on page 84.
4. Locate the heat sink and fan assembly for GPU. See "Locating major FRUs and CRUs" on page 71.
5. Note the routing of the GPU fan cable, and then disconnect the GPU fan cable from the system board.
6. Follow this sequence to remove the four screws that secure the heat sink and fan assembly for GPU
to the system board:
a. Partially remove screw
b. Partially remove screw
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 for GPU.
Figure 43. Removing the heat sink and fan assembly for GPU
7. Lift the failing heat sink and fan assembly for GPU off the system board.
Notes:
a. You might have to gently twist the heat sink and fan assembly for GPU to free it from the
microprocessor.
b. Do not touch the thermal grease while handling the heat sink and fan assembly for GPU.
8. Position the new heat sink and fan assembly for GPU on the system board so that the four screws are
aligned with the corresponding holes in the system board.
9. Follow this sequence to install the four screws to secure the heat sink and fan assembly for GPU, as
shown in Figure 43 "Removing the heat sink and fan assembly for GPU" on page 112.
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ThinkCentre M93z Hardware Maintenance Manual
1 , then fully remove screw
3 , then fully remove screw
2 , and then fully remove screw
4 , and then fully remove screw
1 .
3 .