You have trouble understanding the person you're calling on your Galaxy S21 5G?

Don't panic! In this detailed photo tutorial, we show you step by step how you can easily replace it yourself.

Once you open your device, the specified IP certification (protection against dust and water ingress) will expire.

To avoid scratches on case and screen glass, make sure your workspace is clean and level.

We wish you good luck with your repair!

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.

    €3.00 at the iDoc store
  • Hard Plastic Picks

    Hard Plastic Picks

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

    €3.00 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.

    €8.00 at the iDoc store
  • iFlex opening tool

    iFlex opening tool

    Opening your smartphone can be a very delicate operation, especially if the glue is very persistent. The blade of the flexible but sturdy iFlex measures just 0.15 mm, so it fits in even the smallest gaps, such as between the screen and the frame. The practical iFlex is made of stainless steel and sits comfortably in the hand. This makes it the perfect assistant for every smartphone repair.

    €9.00 at the iDoc store
  • Plastic prying tool

    Plastic prying tool

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

    €3.00 at the iDoc store
  • Suction cup

    Suction cup

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

    €3.00 at the iDoc store
  • Phillips PH00 screwdriver

    Phillips PH00 screwdriver

    You need the right screwdriver for removing PH00 screws.

    €11.00 at the iDoc store

Required replacement part

Show all replacement parts for the Galaxy S21 5G 

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 S21 5G

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

22 steps
  1. Switching off your Samsung Galaxy S21 5G

    Galaxy S21 5G - Switching off your Samsung Galaxy S21 5G 01
    Galaxy S21 5G - Switching off your Samsung Galaxy S21 5G 02
    Galaxy S21 5G - Switching off your Samsung Galaxy S21 5G 03

    Use our checklist to test the basic functions of your Galaxy S21 5G before repairing. This way you can check afterwards if your repair was successful.

    1. Press and hold the side and volume down button simultaneously for a few seconds.
    2. Tap Power off in the displayed menu and confirm with your unlock code.
  2. Heating up the back cover

    Galaxy S21 5G - Heating up the back cover 01
    Galaxy S21 5G - Heating up the back cover 02
    Used tools
    Heat gun

    The edge of the back cover is heavily glued. It is therefore essential to first heat it up sufficiently. Use a hot air device for this purpose, such as a heat gun or an ordinary hair dryer.

    Be careful not to burn your fingers after heating. It is best to heat the back cover only to the point where you can still touch it.
    1. Heat the edge of the back cover by running the hot air device evenly over it.
    Used tools
  3. Lifting up the back cover

    To create a narrow gap between back cover and display unit you need a flat, stable tool. We recommend the iFlex for this, since it has particularly sharp edges that can be easily inserted.

    1. Attach a suction cup to the lower edge of the back cover and pull it upwards. Insert the iFlex between the display unit and the back cover at the same time.
    Used tools
  4. Detaching the back cover

    To avoid damaging the edge of the case with the sharp edges of the iFlex, you should switch to a plastic tool like the iPlastix as soon as possible.

    To avoid damaging the camera module, you should not insert your tool too far into the device. We recommend the hard plastic pick at this point. Due to its shape it cannot be inserted too deeply.

    1. Drive the tool completely around the edge of the back cover to loosen it piece by piece.
    2. Slide flat picks under the back cover at regular intervals, so that the glue cannot bond again.


    Used tools
  5. Removing the back cover

    Galaxy S21 5G - Removing the back cover 01
    Galaxy S21 5G - Removing the back cover 02
    Galaxy S21 5G - Removing the back cover 03
    1. Once the back cover is completely detached, you first have to remove all plastic picks.
    2. Then unfold it and put it aside.
  6. Unscrewing the NFC antenna

    • 5 × 4.9 mm Phillips

    Use a screw storage to keep an overview during the repair and avoid losing anything. Use an old sewing box, for example. With our high-quality magnetic pad, you have the additional advantage that nothing slips.

    1. Loosen the five Phillips screws from the NFC antenna's cover plate.
    2. Then put them on your magnetic pad.
  7. Detaching the battery connector

    Galaxy S21 5G - Detaching the battery connector 01
    Galaxy S21 5G - Detaching the battery connector 02
    Galaxy S21 5G - Detaching the battery connector 03
    Used tools
    • Connector

    Always detach the battery connector as soon as possible to avoid a potential short circuit.

    When separating connectors, always start from the side where there are no small components on the motherboard. This way you avoid potential damage.

    1. Lift up the metal cover of the NFC antenna.
    2. Carefully pry the orange battery connector underneath from the motherboard with a plastic lever tool. We use a plastic spudger for this.
    Used tools
  8. Detaching the NFC antenna's connector

    Galaxy S21 5G - Detaching the NFC antenna's connector 01
    Galaxy S21 5G - Detaching the NFC antenna's connector 02
    Galaxy S21 5G - Detaching the NFC antenna's connector 03
    Used tools
    • Connector
    1. Then separate the black connector of the NFC antenna by carefully levering it off the circuit board with a spudger as well.
    Used tools
  9. Removing the NFC antenna

    Galaxy S21 5G - Removing the NFC antenna 01
    Galaxy S21 5G - Removing the NFC antenna 02
    Galaxy S21 5G - Removing the NFC antenna 03

    The lower end of the NFC antenna is slightly glued.

    1. Once the connectors are separated, you can carefully pull off the NFC antenna.
  10. Unscrewing the earpiece

    • 7 × 4.9 mm Phillips
    1. Loosen the seven Phillips screws from the earpiece.
    2. Then put them on your magnetic pad.
  11. Detaching the earpiece connector

    Galaxy S21 5G - Detaching the earpiece connector 01
    Galaxy S21 5G - Detaching the earpiece connector 02
    Galaxy S21 5G - Detaching the earpiece connector 03
    Used tools
    • Connector
    1. Now separate the connector of the earpiece by carefully levering it off the motherboard with a spudger.
    Used tools
  12. 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
  13. Removing the earpiece

    Galaxy S21 5G - Removing the earpiece 01
    Galaxy S21 5G - Removing the earpiece 02
    1. Take the detached earpiece out of your device and put it aside.
    Used tools
  14. Inserting the earpiece

    Galaxy S21 5G - Inserting the earpiece 01
    Galaxy S21 5G - Inserting the earpiece 02
    Verwendete Ersatzteile
    1. Insert the new earpiece.
    Verwendete Ersatzteile
  15. Screwing the earpiece tight

    • 7 × 4.9 mm Phillips
    1. Screw the earpiece back into place with the seven Phillips screws.
  16. Attaching the earpiece connector

    Galaxy S21 5G - Attaching the earpiece connector 01
    Galaxy S21 5G - Attaching the earpiece connector 02
    Galaxy S21 5G - Attaching the earpiece connector 03
    • Connector
    1. Then reattach the connector of the earpiece to the motherboard.
  17. Inserting the NFC antenna

    Galaxy S21 5G - Inserting the NFC antenna  01
    Galaxy S21 5G - Inserting the NFC antenna  02
    1. Reposition the NFC antenna in the screen unit and press its back end slightly to allow the glue to bond again.
  18. Attaching the NFC antenna's connector

    Galaxy S21 5G - Attaching the NFC antenna's connector 01
    Galaxy S21 5G - Attaching the NFC antenna's connector 02
    Galaxy S21 5G - Attaching the NFC antenna's connector 03
    • Connector
    1. Lift up the metal cover of the NFC antenna to attach the black connector of the NFC antenna that is located underneath.
  19. Attaching the battery connector

    Galaxy S21 5G - Attaching the battery connector 01
    Galaxy S21 5G - Attaching the battery connector 02
    Galaxy S21 5G - Attaching the battery connector 03

    Always connect the battery connector last to avoid a potential short circuit.

    1. You can now also reattach the orange battery connector to the motherboard.
  20. Screwing the NFC antenna tight

    • 5 × 4.9 mm Phillips
    1. Once the battery and NFC antenna connectors are reconnected, you can screw the metal cover back on.
  21. Testing your Galaxy S21 5G

    Galaxy S21 5G - Testing your Galaxy S21 5G 01
    Galaxy S21 5G - Testing your Galaxy S21 5G 02

    If something doesn't work properly during testing, double-check that everything is installed and attached correctly.

    1. Switch on your Galaxy S21.
    2. To test the function of the new earpiece, you should have someone call you.
    3. Open the Samsung test menu via *#0*# in the phone app to test other components. Alternatively, you can also use our checklist.
  22. Attaching a new adhesive frame (optional)

    Galaxy S21 5G - Attaching a new adhesive frame (optional) 01
    Galaxy S21 5G - Attaching a new adhesive frame (optional) 02
    Galaxy S21 5G - Attaching a new adhesive frame (optional) 03
    Galaxy S21 5G - Attaching a new adhesive frame (optional) 04
    Galaxy S21 5G - Attaching a new adhesive frame (optional) 05
    Used tools

    Attaching a new adhesive frame is optional. If it is still in good condition, you do not need to install a new one. However, if it has defects or no longer sticks properly, we recommend that you install a new adhesive frame.

    1. We show you how to apply a new adhesive frame in detail in our YouTube video.
    Used tools
  23. Attaching the back cover

    Galaxy S21 5G - Attaching the back cover 01
    Galaxy S21 5G - Attaching the back cover 02
    Galaxy S21 5G - Attaching the back cover 03
    Galaxy S21 5G - Attaching the back cover 04

    We recommend that you run hot air over the edge of the back cover again, so that the glue bonds properly. You can also weigh down your device with books for a few minutes or clamp it like in our example.

    1. Close your Galaxy S21 5G after the repair by pressing the back cover back onto the display unit.
Ø 0 (0 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 79.00 € 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