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4. Locate the heat sink and fan assembly for GPU. See “Locating components” on page 12.
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 1 , then fully remove screw 2 , and then fully remove screw 1 .
b. Partially remove screw 3 , then fully remove screw 4 , and then fully remove screw 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 for GPU.
Figure 41. 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 41 “Removing the heat sink and fan assembly for GPU” on page 62
.
a. Partially tighten screw 1 , then fully tighten screw 2 , and then fully tighten screw 1 .
b. Partially tighten screw 3 , then fully tighten screw 4 , and then fully tighten screw 3 .
10. Connect the GPU fan cable to the system board. See “Locating parts on the system board” on page 15.
62 ThinkCentre User Guide