Remove The Fingerprint Reader - Lenovo IdeaPad 3 Series Hardware Maintenance Manual

Figure 40. Disconnect the battery pack cable
Step 2. Press the coin-cell battery outwards and then remove it from the system board.
Figure 41. Remove the coin-cell battery
Go to
https://support.lenovo.com/partslookup
replacement part:
Coin-cell battery

Remove the fingerprint reader

Make sure the following FRUs (CRUs) have been removed.
"Remove the lower case" on page 32
"Remove the system fan" on page 46
"Remove the USB board" on page 50
56
IdeaPad 3/IdeaPad 3i/IdeaPad Slim 3/IdeaPad Slim 3i series Hardware Maintenance Manual
to look up the Lenovo part numbers of the following