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Fingerprint reader doesn't work on Galaxy S9 – how to fix it

enero 19, 2020

Samsung Galaxy S9 and Galaxy S9 + are phenomenal phones, excellent in terms of specifications, value for money and the user experience they offer. Even the best ones can get weaker at times and many users around the world have reported that the fingerprint scanner doesn't work on Galaxy S9 and here's how to fix it using the methods below.

See also: How to fix Samsung Galaxy S9 Wi-Fi issues

Fingerprint scanner doesn't work on Galaxy S9 – here's how to fix it

Method 1: change the secure lock time in the settings

Most phones do not pose a hardware problem, since most users are open and attempt to exchange their phones immediately. Based on a user comment posted in the Samsung Support Forum, it looks like you can fix it by changing the secure lockout time in the settings menu.

  1. Tap to open the Settings menu on your Galaxy S9 phone
  2. Scroll down to find the lock screen and security
  3. Open it and find the secure lock settings page
  4. Press to open secure lock time
  5. Once you have reached this step, choose instantly with Power Key or When Screen Times Out

When you use the power button to turn off your screen, you often assume that the phone is instantly locked. However, there is a different interval before it is locked. It can be set to a few seconds, a minute or more depending on your personal preferences. If you try to use the fingerprint sensor to turn on the screen immediately, it will not work until it is locked.

By following the methods mentioned here, you can change the secure lockout time so that your phone responds to your touch each time.

Method 2: Identify if the physical fingerprint hardware is working

Before entering the business of trying to replace your phone or change the settings, it is very important to check if the hardware aspect of the device is working. If the fingerprint sensor was damaged during the transition, if quality control problems are missing to find it, it is absolutely necessary to replace it.

Try using fingerprints to unlock apps, with Samsung Pay or with an app like LastPass that requires a fingerprint check to access them. If there is no problem with the hardware, it will work perfectly. You can again try to unlock your phone using it. If not, the problem is in the software part and you can change the settings or wait for Samsung to launch an update in the near future.

Method 3: reset your fingerprint button on your Galaxy S9

The method applies to both Samsung Galaxy S9 and S9 Plus smartphones. This may seem complicated, which is why we have divided the entire method into small, easy-to-understand steps. Instead of trying to figure it all out at once, follow the instructions and you'll end up operating your button the way it should.

  1. Open the Settings menu on your Samsung Galaxy S9 smartphone
  2. Scroll down to find the option; Lock screen and security
  3. You've probably enrolled up to five fingerprints so you can easily unlock your device
  4. Make sure to delete them all without leaving a trace
  5. Once deleted, restart your phone. You can do this by holding down your power button for a few seconds and choosing the restart option

Create new fingerprints

  1. If the fingerprints already stored on your device are corrupted or if the files are not accessible, the sensor may not detect when you press them
  2. Create a new set of fingerprints
  3. Start by opening the settings, locking the screen and security and configuring the fingerprints
  4. You can also dial * # 0 * # on your dialer to access the service menu.
  5. Choose Sensors, then fingerprint
  6. Press Normal and restart your device once more to correct the problem

Galaxy S9 Finerprint button reset

Method 4: Disable active fingerprint gestures

Although fingerprint gestures do not directly affect the sensor and its response, it is possible that this may cause a problem on your Galaxy S9 Plus phone. The available option is to turn it off completely and see if your phone responds to your touch as it should.

  1. Open the Settings app on your smartphone
  2. Scroll down to find the Advanced Features option
  3. Continue scrolling to find the Finger Sensor Gestures page and turn off the feature
  4. After disabling it, restart your phone.
  5. Wait for the phone to start, give it time, and check if the problem has been resolved

Disabling the Galaxy S9 fingerprint button

Method 5: Manually configure your fingerprint sensor

Samsung has a few tips for beginners on how to use their equipment and find solutions to problems as soon as they arise. If the fingerprint scanner does not work on Galaxy S9, you can revert to manual procedure and one of the most reliable methods. While it's not a big change, the fingerprint sensor ultimately worked for many Galaxy users, which is why you should also try it out.

When setting up your phone for the first time, Samsung suggested not to continue tapping the sensor to record your impression. You should rather run your finger over the button located at the back and detect it without any difficulty. From a generic point of view, it doesn't make much sense, but technically it works; that's why the company suggested it in the first place. You should try the alternative now.

  1. Open your Settings option, go to the lock screen and security
  2. Make sure to delete all the fingerprints previously saved on the smartphone
  3. Samsung will ask you to slide your finger and not touch it
  4. Do not follow their advice and keep your finger firmly on the sensor button until it captures your impressions
  5. Keep repeating the same thing until it registers all of your fingerprints
  6. Make sure to rotate your finger in all directions so that the corners are registered correctly on the phone.

Finish the process and restart your phone. Check to see if your fingerprint sensor is working without problems, and if it is, your problems will be resolved before Samsung even installs software updates. In addition, not all devices will be repaired because, in many cases, the problem is related to the device, its configuration and the way in which a user moves his finger on the sensor.

Galaxy S9 fingerprint setup

Method 6: Get Rid of Physical Problems

Many users try to instantly blame the manufacturer, the hardware or the operating system of the phone. A standard discussion on the Samsung Forum on Reddit confirms that the new version of their phone is just great. Users suggest that compared to older phones such as the Galaxy S8 or even the old Galaxy S6, the new Galaxy S9 and S9 Plus are much better in terms of finger recognition in an instant. It never takes more than two tries even if you get it wrong the first time.

Physical problems are very common when people tend to use their phones. Often they try to unlock themselves with a wet finger, with food or oil on the fingers that cause such problems. Get into the habit of cleaning your thumb, index finger or the finger you registered as the main one to unlock your smartphone securely.

The sensor used in the phone is the fastest and most accurate of all, suggests reviews and users on the Reddit forums. Thorough disassembly even revealed the manufacturing quality of the product and Samsung continues to make it even better with software updates.

Method 7: Hard Clear the cache on your Galaxy S9

When the fingerprint reader does not work Galaxy S9 and you need to know how to repair it, try to clear the cache of your smartphone.

  1. Hold the power button, volume and Bixby button to restart your phone
  2. Wipe the cache memory so that everything in stock is erased
  3. It works much better, especially when Samsung recently launched a software update and your phone is facing fingerprint detection issues.
  4. Set up your fingerprint again and try to unlock it
  5. You can also wait a day or two to let the phone adapt to your model
  6. If that still doesn't work, consider going to the Samsung Galaxy service center to have it repaired or replaced if necessary.

Galaxy S9 clear cover

A quick tip that all Samsung owners should know is that when enrolling your new fingerprints, do not slide and make sure to touch different areas of your fingers. The more you press, the higher your chances of detecting your finger when you try to unlock it.

The recently launched Samsung Galaxy Note 9 is another amazing smartphone, along with the S9 and S9 +. They are impeccable in terms of material, design and manufacturing quality. A new Android operating system is about to start and you just need to follow the tips to keep everything running smoothly and make sure it's not a hardware problem. There are many complaints online that the fingerprint reader doesn't work on the Galaxy S9, but you can easily find out how to fix it by following one or all of the methods mentioned here until it works.