Remove The I/O Board - Lenovo Slim 7i Hardware Maintenance Manual

Figure 14. Disconnect and pull out the cables
Step 2. Remove six screws and remove the fans.
Figure 15. Remove six screws and remove the fans
Screw specifications
M2 × L3.5
Go to
https://support.lenovo.com/partslookup
replacement part:
Fan

Remove the I/O board

Make sure the following FRUs (or CRUs) have been removed.
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Lenovo Slim 7i (14", 8) Hardware Maintenance Manual
Number of screws
6
to look up the Lenovo part numbers of the following