Replacing A Front Fan - Lenovo 90H9 Hardware Maintenance Manual

Step 4. Remove the computer cover. Refer to "Removing the computer cover".
Step 5. Disconnect the fan power cable from the connector on the motherboard.
Step 6. The system fan is locked to the computer case via plastic screw, use a
knife cut off the plastic locking screws, then pull the rear system fan
assembly out of computer case.
Step 7. To install the new system fan:
a. Line up the new system fan with the computer case and secure it to
the computer case with locking screws by pulling the plastic screws
through the locking hole.
b. Connect the system fan power cable to the connector on the board.
Step 8. Reattach the computer cover.

Replacing a front fan

To replace a front fan:
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Lenovo Legion Y720T Hardware Maintenance Manual