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LG G7 Fingerprint Sensor: Setup & Fixes

Updated · Standard formula, shown below

This guide shows you how to set up, use, and troubleshoot the rear-mounted fingerprint sensor on the LG G7 ThinQ. You’ll learn how to register your fingerprints, unlock the phone, and fix common issues like the sensor not responding or failing to recognize your print.

What You’ll Need

  • LG G7 ThinQ with the screen on
  • Your finger (clean and dry)
  • Access to the Settings app

Step-by-Step

  1. Open Settings: Swipe down from the top of the screen to open the notification shade, then tap the gear icon. Alternatively, open the app drawer and tap the Settings app.
  2. Go to Lock Screen & Security: Scroll down and tap “Lock screen & security.” This is where all fingerprint and face unlock options are located.
  3. Select Fingerprints: Tap “Fingerprints.” If you haven’t set a screen lock method yet, you’ll be prompted to set a PIN, pattern, or password first. This is required for security.
  4. Set a Backup Lock Method: Follow the on-screen prompts to create a PIN, pattern, or password. This is your fallback if the fingerprint sensor fails.
  5. Add Your First Fingerprint: Tap “Add fingerprint” (or the plus icon). The phone will ask you to place your finger on the sensor.
  6. Position Your Finger: Place the pad of your finger (the fleshy part) flat on the sensor on the back of the phone, just below the camera. Hold it there until you feel a vibration or see a brief flash on the screen.
  7. Lift and Repeat: Lift your finger and place it again. The phone will guide you to cover different areas of your fingertip—move your finger slightly each time so the sensor captures the edges and center. Keep doing this until the progress ring fills up.
  8. Complete the Setup: When the ring is full, you’ll see a confirmation. Tap “Done” or “OK.” You can now use your fingerprint to unlock the phone.
  9. Add More Fingerprints (Optional): Repeat steps 5–8 for your other hand or a different finger. The G7 can store up to 5 fingerprints.
  10. Test It: Lock the phone by pressing the power button, then place your registered finger on the sensor. The phone should unlock without needing the PIN.

Common Mistakes

  • Using the wrong finger: Make sure you’re using the finger you registered. It’s easy to forget if you added a thumb but are trying to use your index finger.
  • Not covering the sensor fully: The sensor needs to see the whole pad of your finger. If you place just the tip, it won’t match.
  • Dirty or wet fingers: Oil, moisture, or dirt on your finger or the sensor can prevent a good read. Wipe both with a dry cloth.
  • Adding a fingerprint too quickly: If you lift your finger too fast during setup, the phone doesn’t capture enough data. Hold each position for a second or two.
  • Ignoring the backup PIN: If you forget your backup PIN, you can’t add or use fingerprints. Always remember it.

Tips

  • Register the same finger multiple times: If you have trouble with one finger, add it as two separate fingerprints. This increases the chance of a match.
  • Use the sensor for more than unlocking: You can also use it to authorize purchases in the Play Store, approve app logins, and (in some apps) as a quick way to confirm actions.
  • Keep the sensor clean: The sensor is on the back, so it can collect pocket lint. Gently wipe it with a soft, dry cloth occasionally.
  • Warm up your hands: In cold weather, dry or cracked skin can affect recognition. Moisturize or rub your hands together before using the sensor.
  • Use the “Fingerprint unlock” toggle: In the Fingerprints settings, make sure the “Fingerprint unlock” toggle is enabled. If it’s off, the sensor won’t unlock the phone.

Troubleshooting

Fingerprint sensor not working at all:

  1. Restart your phone. This clears minor software glitches.
  2. Check if the sensor is physically damaged. Look for cracks or scratches.
  3. Make sure your screen lock is set to “PIN” or “Password,” not “None.” The sensor won’t work if there’s no lock.
  4. Go to Settings > Lock screen & security > Fingerprints and remove all fingerprints, then re-add them.
  5. If the sensor still doesn’t respond, try a factory reset (back up your data first). This restores the phone to its original state.

Fingerprint not recognized:

  1. Clean your finger and the sensor with a dry, lint-free cloth.
  2. Make sure your finger is centered on the sensor, not off to one side.
  3. Re-add your fingerprint, but this time, cover more of the sensor during setup. Rotate your finger slightly with each press.
  4. If you have a screen protector or case, make sure it doesn’t cover the sensor. Some cases have a cutout that’s too small.
  5. If you’ve recently gotten a cut or burn on your finger, the print may have changed. Add a new fingerprint for that finger.

Sensor works but is slow:

  1. Remove all fingerprints and re-add them, being more careful during setup.
  2. Check for software updates: Settings > System > Update center > System update. An update may improve sensor performance.

Frequently Asked Questions

Can I use the fingerprint sensor to unlock apps?
Yes, many apps (like banking apps) support fingerprint authentication. You’ll need to enable it within each app’s settings.

How many fingerprints can I store?
The LG G7 can store up to 5 fingerprints. You can use them for multiple fingers or even for different people (though that’s not recommended for security).

Does the fingerprint sensor work if the screen is off?
Yes, you can press the sensor to wake and unlock the phone, as long as the phone is not completely powered off. If it’s off, you’ll need to turn it on first, then use the sensor.

Can I use the sensor to take photos?
No, the G7’s fingerprint sensor is not a shutter button. You can use the volume keys or the on-screen button instead.

What if I forget my backup PIN?
You’ll need to perform a factory reset, which erases all data. You can avoid this by remembering your PIN or using a pattern you won’t forget.

Is the fingerprint sensor secure?
Yes, it’s more secure than a simple swipe pattern, but less secure than a strong password. It’s a good balance of convenience and security for everyday use.

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