Remove The I/O Board - Lenovo Flex 3i Chromebook Hardware Maintenance Manual

Go to
https://support.lenovo.com/partslookup
part:
I/O board cable

Remove the I/O board

Make sure the following FRU (or CRU) have been removed.
"Remove the lower case" on page 30
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. Disconnect cables connected to the I/O board.
Figure 9. Disconnect cables connected to the I/O board
Step 3. Remove one screw and then remove the I/O board.
Figure 10. Remove one screw and remove the I/O board
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Hardware Maintenance Manual
to look up the Lenovo part number of the following replacement