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Einleitung

Use this guide to replace a cracked or broken screen on your Xiaomi Mi 9T Pro.

If the frame is deformed, it's important to replace it to make sure the new screen will mount correctly and won’t suffer damage from uneven pressure.

If your battery is swollen, take appropriate precautions. Before disassembling your device, discharge the battery below 25%. The battery can catch fire and/or explode if accidentally punctured, but the chances of that happening are much lower if discharged.

Note: This guide instructs you to replace only the screen while leaving the original frame and motherboard in place. However, some replacement screens for this phone come pre-installed in a new frame (a.k.a. chassis), which requires a very different procedure. Make sure you have the correct part before starting this guide.

Before you begin this procedure, be sure to have a set of replacement adhesives for both the rear glass and the screen.

  1. Prepare an iOpener and apply it to the rear glass for at least two minutes to loosen the adhesive underneath.
    • Prepare an iOpener and apply it to the rear glass for at least two 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.

  2. Secure a suction handle to the bottom edge of the rear glass, as close to the edge as possible. If the rear glass is cracked, the suction handle may not stick. Try lifting it with strong tape, or superglue the suction handle in place and allow it to cure so you can proceed. Lift the rear glass with the suction handle to create a small gap between the back cover and the frame.
    • Secure a suction handle to the bottom edge of the rear glass, as close to the edge as possible.

    • If the rear glass is cracked, the suction handle may not stick. Try lifting it with strong tape, or superglue the suction handle in place and allow it to cure so you can proceed.

    • Lift the rear glass 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 right corner to slice the adhesive.

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

  3. Insert a second opening pick at the bottom edge of your phone. Slide the opening pick to the bottom left corner to slice the adhesive.
    • Insert a second opening pick at the bottom edge of your phone.

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

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

  4. If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener for one to two minutes to reheat it. Insert a third opening pick at the bottom left corner of your phone. Slide the opening pick along the left edge of your phone to slice the adhesive.
    • If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener for one to two minutes to reheat it.

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

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

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

  5. Insert a fourth opening pick underneath the top left corner of your phone. Slide the opening pick along the top edge to slice the adhesive.
    • Insert a fourth opening pick underneath the top left corner of your phone.

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

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

  6. Insert a fifth opening pick underneath the top right corner. Slide the opening pick along the right edge of the rear glass to slice the remaining adhesive.
    • Insert a fifth opening pick underneath the top right corner.

    • Slide the opening pick along the right edge of the rear glass to slice the remaining adhesive.

    • Do not try to remove the rear glass all the way yet. It might be adhered to the phone assembly because of the adhesive around the rear camera.

  7. Carefully try to separate the rear glass from the phone assembly. If you're successful you can ignore this step. In case the rear glass sticks to the rear camera adhesive, continue with this step. Carefully insert a plastic or playing card at the right edge of the phone where the rear camera is located.
    • Carefully try to separate the rear glass from the phone assembly. If you're successful you can ignore this step. In case the rear glass sticks to the rear camera adhesive, continue with this step.

    • Carefully insert a plastic or playing card at the right edge of the phone where the rear camera is located.

    • Use the plastic card to slice the adhesive along the rear camera frame.

  8. Remove the rear glass. Apply new adhesive where necessary after cleaning the relevant areas with isopropyl alcohol (>90%).
    • Remove the rear glass.

    • Apply new adhesive where necessary after cleaning the relevant areas with isopropyl alcohol (>90%).

    • Secure the new rear glass with pre-cut adhesive or double-sided adhesive tape. After installing the rear glass, apply strong, steady pressure to your phone for several minutes to help the adhesive form a good bond—a stack of heavy books works well.

  9. Use a Phillips screwdriver to remove the twelve screws securing the motherboard cover:
    • Use a Phillips screwdriver to remove the twelve screws securing the motherboard cover:

    • Eleven 3.9 mm-long Phillips screws

    • One 2.3 mm-long Phillips screw

  10. Insert the tip of an opening pick underneath the left edge of the motherboard cover. Flip the opening pick sideways to pry up the motherboard cover.
    • Insert the tip of an opening pick underneath the left edge of the motherboard cover.

    • Flip the opening pick sideways to pry up the motherboard cover.

  11. Use a pair of tweezers or your fingers to remove the motherboard cover. Use a pair of tweezers or your fingers to remove the motherboard cover.
    • Use a pair of tweezers or your fingers to remove the motherboard cover.

  12. Use a spudger to disconnect the battery cable by prying the connector straight up from its socket. Use a spudger to disconnect the battery cable by prying the connector straight up from its socket.
    • Use a spudger to disconnect the battery cable by prying the connector straight up from its socket.

  13. Use a Phillips screwdriver to remove the eight 3.9 mm-long screws securing the loudspeaker assembly.
    • Use a Phillips screwdriver to remove the eight 3.9 mm-long screws securing the loudspeaker assembly.

  14. Insert an opening pick into the gap between the top edge of the loudspeaker assembly and the battery. Use your opening pick to pry up the loudspeaker assembly.
    • Insert an opening pick into the gap between the top edge of the loudspeaker assembly and the battery.

    • Use your opening pick to pry up the loudspeaker assembly.

  15. Remove the loudspeaker assembly. During reassembly apply new adhesive where it's necessary after cleaning the relevant areas with isopropyl alcohol (>90%).
    • Remove the loudspeaker assembly.

    • During reassembly apply new adhesive where it's necessary after cleaning the relevant areas with isopropyl alcohol (>90%).

  16. Use a pair of tweezers to carefully peel the sticker off the interconnect cable. Use a pair of tweezers to carefully peel the sticker off the interconnect cable.
    • Use a pair of tweezers to carefully peel the sticker off the interconnect cable.

  17. Use a spudger to disconnect the interconnect cable by prying the connector straight up from its socket. Use a spudger to disconnect the interconnect cable by prying the connector straight up from its socket.
    • Use a spudger to disconnect the interconnect cable by prying the connector straight up from its socket.

  18. The display cable is adhered onto the midframe by mild adhesive. Carefully slide the tip of an opening pick underneath the display flex connector to separate it from the midframe.
    • The display cable is adhered onto the midframe by mild adhesive.

    • Carefully slide the tip of an opening pick underneath the display flex connector to separate it from the midframe.

  19. Apply a  heated iOpener or a heat gun to the screen to loosen the adhesive underneath. Apply the iOpener for at least two minutes.
    • Apply a heated iOpener or a heat gun to the screen to loosen the adhesive underneath. Apply the iOpener for at least two minutes.

    • A hair dryer, heat gun, or hot plate may also be used, but be careful not to overheat the device.

  20. Once the screen is warm to the touch, apply a suction handle to the bottom edge of the screen. If your screen is badly cracked, covering it with a layer of clear packing tape may allow the suction handle to adhere. Alternatively, very strong tape may be used instead of the suction handle. If all else fails, you can superglue the suction handle to the screen. Lift the screen with the suction handle to create a small gap between the screen and the frame.
    • Once the screen is warm to the touch, apply a suction handle to the bottom edge of the screen.

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

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

    • Insert an opening pick into the gap between the midframe and the screen.

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

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

  21. Insert a second opening pick at the bottom edge and slide it to the bottom left corner of the screen to slice the adhesive. Leave the opening pick in place to prevent the adhesive from resealing.
    • Insert a second opening pick at the bottom edge and slide it to the bottom left corner of the screen to slice the adhesive.

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

  22. If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener or heat gun for 1-2 minutes to reheat it. Insert a third opening pick underneath the bottom left corner of the screen. Slide the opening pick along the left edge of the screen to slice the adhesive.
    • If the adhesive becomes hard to cut, it has most likely cooled down. Use your iOpener or heat gun for 1-2 minutes to reheat it.

    • Insert a third opening pick underneath the bottom left corner of the screen.

    • Slide the opening pick along the left edge of the screen to slice the adhesive.

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

  23. Insert a fourth opening pick at the top left corner of the screen. Slide the opening pick along the top edge of the phone to slice the adhesive.
    • Insert a fourth opening pick at the top left corner of the screen.

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

  24. Insert a fifth opening pick and slide it along the right edge of the phone to slice the remaining adhesive. Do not try to remove the display all the way yet, the display cable is still threaded through the frame.
    • Insert a fifth opening pick and slide it along the right edge of the phone to slice the remaining adhesive.

    • Do not try to remove the display all the way yet, the display cable is still threaded through the frame.

  25. Thread the display flex cable through the gap in the midframe and remove the screen. Compare your new replacement part to the original part—you may need to transfer remaining components from your old screen to your replacement part. Apply new adhesive where it's necessary after cleaning the relevant areas with isopropyl alcohol (>90%).
    • Thread the display flex cable through the gap in the midframe and remove the screen.

    • Compare your new replacement part to the original part—you may need to transfer remaining components from your old screen to your replacement part.

    • Apply new adhesive where it's necessary after cleaning the relevant areas with isopropyl alcohol (>90%).

    • During reassembly, follow this guide in case you're using a pre-cut adhesive card.

Abschluss

If possible, turn on your device and test your repair before installing new adhesive and resealing.

To reassemble your device, follow these instructions in reverse order.

The best way to secure the new screen is to apply a sheet of custom-cut double-sided tape to the back of the screen.

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.

Dominik Schnabelrauch

Mitglied seit: 23.11.2016

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