Remove The I/O Board - Lenovo 16IRU8 Hardware Maintenance Manual

Screw specifications
M2 x L3.5
Go to https://support.lenovo.com/partslookup
part:
Fan

Remove the I/O board

Make sure the following FRUs (or CRUs) have been removed.
"Remove the lower case" on page 35
Step 1. Disconnect the battery pack cable from the system board.
Attention: Use your fingernails to pull the connector to unplug it. Do not pull the cable.
Step 2. Remove three screws then open the right hinge.
Figure 16. Open the right hinge
Screw specifications
M2.5 x L5
M2 x L5
Step 3. Disconnect the I/O board cable from the I/O board. Remove one screw then remove the I/O board.
Number of screws
3
to look up the Lenovo part number of the following replacement
Number of screws
2
1
.
Chapter 4 Removing a FRU or CRU
41