You're now left with the screen.

To ensure that your optical fingerprint sensor is secure and accurate, perform a fingerprint sensor calibration after you've reassembled the device:

You'll need the calibration toolkit, which includes three rubber calibration blocks.

Download the Self Repair Assistant app on your device.

Follow this calibration guide.

Alternatively, you can read the Samsung Self-Repair document to learn how to calibrate your sensor. The fingerprint sensor calibration instructions start on page 28.