Remove The I/O Board - Lenovo Chromebook S345-14AST Hardware Maintenance Manual

Step 3. Remove the Wi-Fi card by pulling it away from the slot.
Figure 11. Remove the Wi-Fi card
Refer to "Major FRUs and CRUs" on page 30 to look up details about the following replacement part:
Wi-Fi card

Remove the I/O board

Make sure the following FRUs (or CRUs) have been removed.
"Remove the lower case" on page 36
"Remove the battery pack" on page 37
Step 1. Detach the two I/O board connectors from the system board.
Figure 12. Detach the two I/O board connectors
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Lenovo Chromebook S345-14AST Hardware Maintenance Manual