Remove The I/O Board - Lenovo V14 Gen 4 i Hardware Maintenance Manual

"Remove the lower case" on page 38
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 and then release the cable from the cable guide.
Figure 21. Remove three screws and then release the cable from the cable guide
Screw specifications
M2 x L5
Step 3. Loosen four screws and then remove the thermal module.
Figure 22. Loosen four screws and then remove the thermal module
Go to https://support.lenovo.com/partslookup
part:
Thermal module

Remove the I/O board

Make sure the following FRU (or CRU) have been removed.
"Remove the lower case" on page 38
Step 1. Disconnect the battery pack cable from the system board.
Number of screws
3
to look up the Lenovo part number of the following replacement
.
Chapter 4 Removing a FRU or CRU
45