Samsung Galaxy S8 fingerprint sensor repair guide

The fingerprint sensor no longer recognizes your fingerprint.

  • Galaxy S8
  • 8 Steps
  • Medium
  • 30 min.
Go to the guide

Introduction

This repair guide shows you how to replace the fingerprint sensor of your Galaxy S8. This fix is necessary, if your Galaxy S8 no longer recognizes your fingerprints or doesn't let you register new fingerprints.

Required tools

  • Flat Picks

    Flat Picks

    You need a very flat tool such as a flat pick to pry out parts that are glued in place.

    €2.00 at the iDoc store
  • Heat gun

    Heat gun

    You can use a heat gun to heat parts that are glued on so they’re easier to remove. In most cases, you can also use a hairdryer.

    from €14.47 on Amazon
  • For storing screws

    For storing screws

    We recommend storing your screws so you don’t mix up the various screws and small parts.

    €10.00 at the iDoc store
  • Tweezers

    Tweezers

    We recommend using tweezers to remove screws and various small parts from your device.

    €10.00 at the iDoc store
  • Plastic prying tool

    Plastic prying tool

    You need a flat plastic prying tool to disconnect the various plugs and connectors.

    €2.00 at the iDoc store
  • Suction cup

    Suction cup

    A suction cup is perfect for lifting smooth surfaces such as displays or rear glass panels.

    €2.00 at the iDoc store
  • Phillips PH00 screwdriver

    Phillips PH00 screwdriver

    You need the right screwdriver for removing PH00 screws.

    €13.00 at the iDoc store

Required replacement part

  • Samsung Galaxy S8 / S8+ Fingerprint Sensor in Midnight Black

    Samsung Galaxy S8 / S8+ Fingerprint Sensor in Midnight Black

    €23.00 at the iDoc store
Show all replacement parts for the Galaxy S8 

Replacement parts and tools for this repair

Our tools plus the right spare part help you fix your device easily.

Getting started with the repair of your Galaxy S8

If you get stuck or have questions, you can post a comment. We’d be happy to help.

8 steps
  1. Switching off your device

    Galaxy S8 - Switching off your device 01
    Galaxy S8 - Switching off your device 02
    Galaxy S8 - Switching off your device 03
    1. Shut down your Galaxy S8 by pressing the power button until you see the option "Switch off".
    2. Now you can confirm the shut down of the mobile phone. Start the next step as soon as the screen stays black.
  2. Removing the SIM and microSD card tray

    Galaxy S8 - Removing the SIM and microSD card tray 01
    Galaxy S8 - Removing the SIM and microSD card tray 02
    1. Now remove the SIM tray including your card by using a SIM tool.
  3. Removing the back cover

    Galaxy S8 - Removing the back cover 01
    Galaxy S8 - Removing the back cover 02
    Galaxy S8 - Removing the back cover 03
    Galaxy S8 - Removing the back cover 04
    Galaxy S8 - Removing the back cover 05
    Galaxy S8 - Removing the back cover 06

    Now you have to release the back cover of the Galaxy S8. As this is glued, you will need a heat gun or a regular hairdryer. The heat will loosen the glue, so that you can remove the back cover more easily. In addition, you'll need a flat, flexible tool like the iPlastix or iFlex as well as several picks to remove the back cover all around.

    1. Heat the back cover all around with a hair dryer to loosen the glue. Do not put the hair dryer too far away, you will need it again and again in between. Place a suction cup on the bottom of the back cover.
    2. Pull the suction cup on the key ring upwards and try to press a flat tool like the iPlastix or iFlex between the back glass and the frame at the same time. You can always use the hair dryer to help you do this, so that the heat will loosen the glue at this point.

    The iPlastix is made of plastic, which protects the frame from scratches. However, the tool is very soft and therefore difficult to insert.

    The backcover is made of glass and will break easily. For this reason, be very careful when removing the back cover. If necessary, use the hair dryer and the flat tool again and again. This step may take you more time than you think - even experts need up to half an hour to remove the back cover. So take some time to complete this step to make sure you don't break anything.

    1. Once you have managed to insert the flat tool between the back glass and the frame, you now insert a plectrum into the gap. This way the gap remains open and you can take out your tool again.
    2. Repeat this along the entire edge. Pull the tool through the gap to loosen the glue bit by bit.
    3. In between you can always reach for a hair dryer. Re-heat the area you are working on. In this way, you will gradually insert the other picks.

    On the lower side the backcover is more strongly glued than on the other places.

    1. The fingerprint sensor is connected with a cable under the camera. Therefore, lift the back cover very slightly once you have loosened it everywhere.
  4. Disconnecting the fingerprint sensor

    Galaxy S8 - Disconnecting the fingerprint sensor 01
    Galaxy S8 - Disconnecting the fingerprint sensor 02
    Galaxy S8 - Disconnecting the fingerprint sensor 03
      1. After loosening the back cover and carefully lifting it up, disconnect the fingerprint sensor from the spudger.
      2. Now the back cover is completely detached - you can lift it off and put it aside.


      1. The right tools for your repair

        With the right tools, you will succeed in any repair. In our store you will find a large selection of professional quality tools.
        VIEW NOW
      2. Removing the fingerprint sensor

        Galaxy S8 - Removing the fingerprint sensor 01
        Galaxy S8 - Removing the fingerprint sensor 02
        Galaxy S8 - Removing the fingerprint sensor 03

        Carefully run the steel spatula around the edges of the fingerprint sensor to unglue it.

        Once it is completely unglued, you can take out the sensor easily.

        If the sensor is hard to remove, use a heat gun to soften the glue.

      3. Inserting the new fingerprint sensor

        Galaxy S8 - Inserting the new fingerprint sensor 01
        Galaxy S8 - Inserting the new fingerprint sensor 02
        Galaxy S8 - Inserting the new fingerprint sensor 03
        1. Put fingerprint sensor back into its original position on the back cover.
        2. Slightly press down the sensor so the glue bonds better.
      4. Attaching the back cover

        Galaxy S8 - Attaching the back cover 01
        Galaxy S8 - Attaching the back cover 02
        Galaxy S8 - Attaching the back cover 03
        1. Place the back in the original place.
        2. Connect the fingerprint sensor again.
        3. Now press the back cover on the whole surface so that the adhesive surface can re-attach.

        So that the original glue lasts better, you can warm up your phone again with a hair dryer. If you then clamp the Galaxy S8 or weigh it down with some books, you can further optimise the result.

      5. Inserting the SIM and microSD card tray

        Galaxy S8 - Inserting the SIM and microSD card tray 01
        1. Now you have to put the SIM card holder back into your Galaxy S8. The slide must be aligned correctly.
      Ø 5 (1 Ratings)

      Bewerte unsere Anleitung

      Hat dir unsere Anleitung weitergeholfen? Wir sind auf deine Beurteilung gespannt.

      Submit rating

      Submit rating

      How did you like this repair guide?

      Exceptional

      Similar guides

      You might also be interested in these guides.

      You might be interested in

      Get in touch with iDoc

      Please contact our customer service for any questions about iDoc's products and services.

      • Send a message

        If you have a question about a guide or want to give us general feedback, just use our contact form

        Write a message
      • Free shipping

        From a minimum order value of 39.00 € your order will be shipped free of charge within Germany.

      • Call iDoc

        If you have any questions about our guides or services, call us from Monday to Friday, 10:00 a.m. to 6:00 p.m.

        +49 30 200 514 455
      • 5 star service

        We offer top quality and service. Our customers confirm this as well.

        Show reviews

      Profi-Insights & Tipps für deine erfolgreiche Handy-Reparatur

      iDoc schenkt dir den ultimativen Reparatur-Guide GUIDE GRATIS ANFORDERN

      Profi-Insights & Tipps für deine erfolgreiche Handy-Reparatur

      iDoc schenkt dir den ultimativen Reparatur-Guide GUIDE GRATIS ANFORDERN