Lenovo ThinkCentre M70a Hardware Maintenance Manual page 92

The heat sink might be very hot. Before you open the computer cover, turn off the computer and wait several
minutes until the computer is cool.
Replacement procedure
1. Remove the computer stand. See "Computer stand" on page 61.
2. Remove the rear cover. See "Rear cover" on page 65.
3. Remove the optical drive. See "Optical drive" on page 66.
4. Remove the optical drive holder. See "Optical drive holder" on page 69.
5. Remove the system board shield. See "System board shield" on page 71.
6. Remove the VESA mount bracket cover. See "VESA mount bracket cover" on page 74.
7. Remove the VESA mount bracket. See "VESA mount bracket" on page 76.
8. Depending on your computer model, refer to one of the following to replace the heat sink.
Notes:
• Carefully remove the screws from the system board to avoid any possible damage to the system
board. The screws cannot be removed from the heat sink.
• You might have to gently twist the heat sink to free it from the microprocessor.
• Do not touch the thermal grease while handling the heat sink.
• M70a
Figure 56. Removing the heat sink
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M70a and M90a Hardware Maintenance Manual