Mobile Fingerprint Sensor Not Detecting – Repair Guide

🔍 Common Causes

1. Dirty or Scratched Sensor – Dust, sweat, or scratches block recognition.

2. Software Glitch – System bugs or outdated OS.

3. Hardware Damage – Faulty flex cable or damaged sensor.

4. Moisture/Heat Exposure – Causes internal malfunction.

5. Improper Installation – After screen replacement or repair.

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🛠 Step-by-Step Repair Guide

Step 1: Basic Cleaning

Gently wipe the sensor with a microfiber cloth.

Use isopropyl alcohol to remove dirt and oil.

Step 2: Software Check

Restart the mobile.

Delete old fingerprints → Re-add new ones.

Update OS/software.

Step 3: Safe Mode Test

Boot into safe mode.

If sensor works → Problem is with third-party apps.

Step 4: Hardware Inspection

Disassemble phone carefully.

Check fingerprint sensor flex cable.

Re-seat or replace faulty connector.

Step 5: Sensor Replacement

If still not working → Replace fingerprint module.

For in-display sensors, ensure proper alignment with OLED.

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⚡ Pro Tips

Always test fingerprint after screen replacement.

Avoid pressing sensor with sharp nails or tools.

Use original replacement parts for accuracy.