Remove The Wlan Card - Lenovo Chromebook C340 Hardware Maintenance Manual

Step 3. Remove the I/O board.
Figure 9. Remove the I/O board
Go to
https://support.lenovo.com/partslookup
replacement part:
I/O board with cable

Remove the WLAN card

Make sure the following FRU (or CRU) have been removed.
"Remove the lower case" on page 28
"Remove the battery pack" on page 29
"Remove the I/O board with cable" on page 31
Step 1. Disconnect the antenna cables from the WLAN card.
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Lenovo Chromebook C340 and S340 Hardware Maintenance Manual
to look up the Lenovo part numbers of the following