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Introduction

Use this guide to replace the USB-C charging port and daughterboard on your Samsung Galaxy S21 Ultra.

Before you begin, refer to the Samsung Self-Repair document for safety information.

Note: Retaining water resistance after the repair will depend on how well you reapply the adhesive, but your device will lose its IP (Ingress Protection) rating.

  1. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Heat the back cover: step 1, image 1 of 1
    • Unplug and power off your phone before you begin.

    • Prepare an iOpener and apply it to the back cover for at least three minutes to loosen the adhesive underneath.

    • A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the phone—the display and internal battery are both susceptible to heat damage.

    I have had no luck with the iOpener so far after heating it for 30 seconds. At what temperature does the glue become loose? I noticed that the iOpener heated up the back of the phone to up to 110F (43 C).

    Imtiaz Chowdhury - Reply

    Hi Imtiaz,
    if you're struggling to get the adhesive loose enough you can try to reapply the iOpener several times or try using a hair dryer or heat gun instead. In terms of temperature, I'm afraid I can't give you an exact number for when it's high enough for the adhesive to loosen, as that varies by manufacturer and model.

    Dominik Schnabelrauch -

  2. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Insert an opening pick: step 2, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Insert an opening pick: step 2, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Insert an opening pick: step 2, image 3 of 3
    • Secure a suction handle to the bottom edge of the back cover, as close to the edge as possible.

    • If the back cover is badly cracked, covering it with a layer of clear packing tape may allow the suction cup to adhere. Alternatively, very strong tape may be used instead of the suction cup. If all else fails, you can superglue the suction cup to the broken cover.

    • Lift the back cover with the suction handle to create a small gap between the back cover and the frame.

    • If you have trouble creating a gap, apply more heat to further soften the adhesive. Follow the iOpener instructions to avoid overheating.

    • Insert an opening pick into the gap you created.

    • Slide the opening pick to the bottom left corner to slice the adhesive.

    • Leave the opening pick in place to prevent the adhesive from resealing.

  3. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Slice the adhesive: step 3, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Slice the adhesive: step 3, image 2 of 2
    • Insert a second opening pick at the bottom edge of your phone.

    • Slide the opening pick to the bottom right corner to slice the adhesive.

    • Leave the opening picks in place to prevent the adhesive from resealing.

  4. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 4, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 4, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 4, image 3 of 3
    • If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener for two to three minutes to reheat it.

    • Insert a third opening pick at the bottom right corner of your phone.

    • Slide the opening pick along the right edge of your phone to slice the adhesive.

    • Leave the opening pick in the top right corner to prevent the adhesive from resealing.

  5. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 5, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 5, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 5, image 3 of 3
    • When you slice near the camera assembly, insert only the tip of the opening pick (~ 4-5 mm) to avoid damaging or smearing the camera.

    • Insert a fourth opening pick underneath the top right corner of your phone.

    • Slide the opening pick along the top edge to slice the adhesive.

    • Leave the opening pick in the top left corner to prevent the adhesive from resealing.

  6. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 6, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 6, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement: step 6, image 3 of 3
    • Insert a fifth opening pick underneath the top left corner.

    • Slide the opening pick along the left edge of the back cover to slice the remaining adhesive.

    • When you slice near the power button, insert only the tip of the opening pick (~ 3-4 mm) to avoid damaging the power and volume button flex cable.

  7. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the back cover: step 7, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the back cover: step 7, image 2 of 2
    • Remove the back cover.

    • During reassembly:

    • This is a good point to power on your phone and test all functions before sealing it up. Be sure to power your phone back down completely before you continue working.

    • Remove any adhesive chunks with a pair of tweezers or your fingers. Apply heat if you're having trouble separating the adhesive.

    • If you're using Samsung custom-cut adhesives, follow this guide.

    • If you're using double-sided tape, follow this guide.

  8. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Slice the adhesive: step 8, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Slice the adhesive: step 8, image 2 of 2
    • Insert an opening pick underneath the left bottom end of the NFC antenna and charging coil assembly.

    • Carefully slide the opening pick along the bottom left edge of the assembly to separate it from the battery.

  9. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the charging coil: step 9, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the charging coil: step 9, image 2 of 2
    • Use a spudger to disconnect the charging coil by prying the connector straight up from its socket.

  10. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the NFC antenna: step 10, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the NFC antenna: step 10, image 2 of 2
    • Use a spudger to disconnect the NFC antenna by prying the connector straight up from its socket.

  11. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Unfasten the NFC antenna & charging coil assembly: step 11, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Unfasten the NFC antenna & charging coil assembly: step 11, image 2 of 2
    • Use a Phillips screwdriver to remove the five 3.9 mm-long screws securing the NFC antenna and charging coil assembly.

    • If you're reassembling with the Samsung Self-Repair kit, be sure to replace the screws with new ones labeled #3427.

  12. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Unfasten the loudspeaker: step 12, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Unfasten the loudspeaker: step 12, image 2 of 2
    • Use a Phillips screwdriver to remove the four 3.9 mm-long screws securing the loudspeaker assembly.

    • If you're reassembling with the Samsung Self-Repair kit, be sure to replace the screws with new ones labeled #3427.

  13. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the loudspeaker: step 13, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the loudspeaker: step 13, image 2 of 2
    • Insert the tip of a spudger between the frame and the upper-left notch in the loudspeaker.

    • Pry up with the spudger to release the loudspeaker from its plastic clips.

  14. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the NFC antenna & charging coil assembly: step 14, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the NFC antenna & charging coil assembly: step 14, image 2 of 2
    • Use a pair of tweezers or your fingers to carefully remove the NFC antenna, charging coil, and loudspeaker assembly.

    • Set the assembly aside. You'll reuse it during reassembly.

  15. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the interconnect cables: step 15, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the interconnect cables: step 15, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Disconnect the interconnect cables: step 15, image 3 of 3
    • Use a spudger to pry up and disconnect the primary and secondary interconnect cables' press connectors on the motherboard.

  16. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the secondary interconnect cable: step 16, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the secondary interconnect cable: step 16, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the secondary interconnect cable: step 16, image 3 of 3
    • Use a spudger to disconnect the secondary interconnect cable from the daughterboard by prying its bottom connector straight up from its socket.

    • Use your fingers or a pair of tweezers to carefully remove the secondary interconnect cable.

    • Set the cable aside. You'll reuse it during reassembly.

    Personnellement je trouve que c'est moins risqué d'endommager les flex en les laissant branchés au circuit de charge

    Olivier Fafard - Reply

  17. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the primary interconnect cable: step 17, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the primary interconnect cable: step 17, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the primary interconnect cable: step 17, image 3 of 3
    • Use a spudger to disconnect the primary interconnect cable from the daughterboard by prying its bottom connector straight up from its socket.

    • Use your fingers or a pair of tweezers to carefully remove the primary interconnect cable.

    • Set the cable aside. You'll reuse it during reassembly.

  18. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Unfasten the charging board: step 18, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Unfasten the charging board: step 18, image 2 of 2
    • Use a Phillips screwdriver to remove the three 3.4 mm-long screws securing the charging board.

    • If you're reassembling with the Samsung Self-Repair kit, be sure to replace the screws with new ones labeled #3428.

  19. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Pry up the charging board: step 19, image 1 of 2 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Pry up the charging board: step 19, image 2 of 2
    • Insert the pointed end of a spudger underneath the left edge of the charging board next to the main flex cable connector.

    • Use your spudger to pry up the charging board.

  20. Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the charging board: step 20, image 1 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the charging board: step 20, image 2 of 3 Samsung Galaxy S21 Ultra USB-C Charging Port and Daughterboard Replacement, Remove the charging board: step 20, image 3 of 3
    • Use a pair of blunt tweezers or your fingers to remove the charging board. Start by lifting its top edge up and then carefully slide the USB-C connector out of its recess.

Conclusion

To reassemble your device, follow the instructions in reverse order and perform the opposite actions, e.g., "reattach" instead of "removing." Skip steps that use heating and prying, and pay close attention to the 📌 bullets as you work through the steps.

After you've completed the repair, download the Samsung Members App from the Galaxy Store or the Play Store, and follow the Samsung Self-Repair document (beginning page 9) to make sure your device is fully functional.

Take your e-waste to an R2 or e-Stewards certified recycler.

Repair didn’t go as planned? Try some basic troubleshooting, or ask our Answers community for help.

2 other people completed this guide.

Alex Diaz-Kokaisl

Member since: 01/16/2022

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3 Comments

Hi,

One month ago I dropped my phone in pool and I took it to the service center where they have dried out the phone. Everything was working fine but later only I was able to find out that the primary microphone is not working and also sim doesn't get detect. So couple of times I did resetting the phone pressing the volume down and power button and that fixed the SIM related issue. After couple of weeks again there was an error saying SIM can't be detected and I tried the same solution , after several attempts it detected again. Then again after two days the issue pops up once again. So I was able to find out that primary microphone and SIM card slot is in the same daughter board and thought of replacing it by myself. I got the new board and replaced it yesterday and still my microphone is not working. What would be the solution ? Is there anything I need to check/replace further like flex cables and all ? Please advise. Appreciate your help.

Thanks

Rahul Manayath - Reply

Hi Rahul!

If your speaker still isn't working after you replaced your daughterboard, then I would suggest replacing the loudspeaker itself. Unfortunately, we don't sell the loudspeaker currently, so you would have to find it from a different source. I wish you the best of luck in your repair!

Alex Diaz-Kokaisl - Reply

Hi

Everytime i put my phone on charge sometimes it works fine but if i take it out and put it back in again it keeps coming up with the moisture detected but theres no water inside there i dried it out and left it alone but before i didnt realise my lead was a little wet would that cause i massive problem charging

shexi_rudeboi_jmz - Reply

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