Replacing The Heat-Sink - Lenovo H520s Hardware Maintenance Manual

Step 6. Remove the 4 screws that secure the microprocessor fan to the heat-sink and lift up the
microprocessor fan to remove it.
Step 7. To install the new microprocessor fan:
a. Line up the new microprocessor fan with the heat-sink and secure it to the heat-sink with
4 screws.
b. Connect the microprocessor fan power cable to the connector on the board.
Step 8. Reattach the computer cover.

Replacing the heat-sink

Note: For this procedure, it helps to lay the computer flat.
To replace the heat-sink:
Step 1. Remove any media (disks, CDs, DVDs, or memory cards) from the drives, shut down the operating
system, and turn off the computer and all attached devices.
Step 2. Unplug all power cords from electrical outlets.
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Lenovo H520sHardware Maintenance Manual