Remove The Main Board - Lenovo Yoga C940–15IRH Hardware Maintenance Manual

Figure 20. Disconnect the fingerprint sensor cable
Step 4. Remove the fingerprint sensor.
Figure 21. Remove the fingerprint sensor
Go to https://support.lenovo.com/partslookup
part:
Fingerprint sensor

Remove the main board

Make sure the following FRU (or CRU) have been removed.
"Remove the active pen" on page 28
"Remove the lower case" on page 29
"Remove the battery pack" on page 30
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Lenovo Yoga C940–15IRH Hardware Maintenance Manual
to look up the Lenovo part number of the following replacement