Symptoms
- Fingerprint not recognized or takes many tries
- Sensor area doesn't light up when you touch it
- Works with some fingers but not others
- Started failing after applying a new screen protector
Likely causes
- CommonScreen protector not compatible with the fingerprint sensorMany protectors block or distort the optical or ultrasonic signal the sensor needs.
- CommonDirty screen, wet finger, or oily residue over the sensorThe sensor needs a clean, clear contact to read your fingerprint accurately.
- CommonFingerprint enrollment needs updatingRegistered prints can become less accurate over time; re-enrolling often helps.
- PossibleSoftware bug after an updateUpdates can occasionally require re-enrolling fingerprints.
What to do
- Clean the screen and dry your finger, then try again.
- Remove the screen protector to test if it's blocking the sensor; if that fixes it, buy a protector labeled compatible with in-display fingerprint sensors.
- Delete your saved fingerprint and re-enroll it, pressing firmly and covering the whole fingertip during setup.
- Restart the phone and check for a software update.
- Try a different finger to rule out one specific print being poorly registered.
Tools and parts
- Microfiber cloth
Fingerprint-sensor-compatible screen protectorSearch: “fingerprint sensor compatible screen protector for [your phone model]”
When to call a pro
See a repair shop if re-enrolling, cleaning, and removing the protector don't help, since the in-display sensor hardware may have failed.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.