Lenovo 0870A6U, User Manual

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6. Follow this sequence to remove the four screws that secure the heat sink 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.
7. Lift the failing heat sink off the system board.
Notes:
a.
You might have to gently twist the heat sink to free it from the
microprocessor.
b. Do not touch the thermal grease while handling the heat sink.
8.
Position the new heat sink 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, as
shown in Figure 23.
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. To reinstall the fan duct, position the fan duct on the heat sink and then press
the fan duct downward until the two tabs on the fan duct are secured into
place.
Figure 23. Removing the heat sink
32
User Guide