Teardown difficulty:
Moderate
Duration:
10 min

Recommended tools

Disassembly of the mobile device Xiaomi Mi 9 (Xiaomi Mi 9 M1902F1G) with each step description and the required set of tools.


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How to disassemble Xiaomi Mi 9, Step 1/1 How to disassemble Xiaomi Mi 9, Step 1/2

Step 1. Remove the tray

Use the ejection tool (aka Needle) or Paperclip. Push the tip all the way into the hole until the tray ejects, and then pull the tray of SIM and Memory card (Micro SD) out.

⚠️ Pay attention! The tool must be inserted into a hole on the edge of the phone's housing. Do not press too hard. It may break the tray eject mechanism.


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Step 2. Open the back cover

We recommend using a special heating device such as a separator machine, heat gun, or heating mat. It will simplify the process. You can use a home hairdryer, but you will have to make a nozzle by hand or have a suitable one in the kit to gently heat and concentrate the heat flow in the right place.

ℹ️️ The surface of the back cover must be heated to soften the adhesive underneath. The approximate heating temperature is 50° C / 125° F.

Use a thin plastic film or pick for separation. To facilitate the process, you can use isopropyl alcohol. It is often most difficult to pass the tool between the parts to be divided. Choose the far edge from the FFC cables or buttons.

Do not use a lever or any force for separation that could damage the elements inside.


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Step 3. Unscrew the screws

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 10 screws.


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Step 4. Open the cover

Remove the cover with an NFC tag and antennas that protect the printed circuit board (PCB). Try to lift the covers by the edges and not push anything between them to not accidentally touch or short-circuit anything on the PCB.


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Step 5. Disconnect the battery connector

Disconnect the battery connector as soon as possible.

ℹ️️ The Xiaomi Mi 9 model has a battery BM3L with 3200 mAh capacity (aka rechargeable battery).

⚠️ It is highly recommended to disconnect the connector to avoid possible short circuits during disassembly.

Also, try not to use a metal tool to disconnect the rechargeable battery connector or do it carefully.


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Step 6. Open the cover

Pry up the flashlight connector and remove the cover for the cameras.


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Step 7. Remove the front camera

Disconnect the connector on the motherboard, and remove the front (selfie) camera.


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Step 8. Disconnect the connectors

Pry up the connectors of the display module cable, inter-board cable, and two coaxial cables.

⚠️ Be careful when removing the cables from the connectors, the cables are pretty thin, and it is easy enough to break them or damage the contact tracks inside.


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Step 9. Unscrew one screw

Using a screwdriver (Phillips 1.5 mm PH000), unscrew one screw.


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Step 10. Remove the motherboard

Carefully remove the printed circuit board. There is no need to use a lever or try to reach the board by force. Make sure that nothing is getting in the way or holding the board.

⚠️ Do not bend the circuit board when removing it or push tools under it. Unbeknownst to yourself, you can damage components or cables from the inside.


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Step 11. Unscrew the screws

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 4 short screws.


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Step 12. Unscrew the screws

Using a screwdriver (Phillips 1.5 mm PH000), unscrew two long screws.


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Step 13. Unscrew one screw

Using a screwdriver (Phillips 1.5 mm PH000), unscrew one small screw.


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Step 14. Remove the loudspeaker

Pry the loudspeaker assembly up and turn it over.


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Step 15. Disconnect the connector

Disconnect the coaxial cable connector.


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Step 16. Remove the battery

Carefully remove the battery.


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Step 17. Remove the coaxial cable

Pry up the connector and remove the coaxial cable.


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Step 18. Remove the inter-board cable

Carefully, preferably from the edge, disconnect the connector and remove the inter-board cable connecting the mainboard to the daughterboard (also known as the sub-board).

⚠️ Be careful when removing the cables from the connectors, the cables are pretty thin, and it is easy enough to break them or damage the contact tracks inside.

ℹ️️ An arrow on the FFC cable (flexible flat cable) indicates its correct position.


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Step 19. Unscrew one screw

Using a screwdriver (Phillips 1.5 mm PH000), unscrew one small screw.


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Step 20. Disconnect the connector

Disconnect the fingerprint sensor connector.


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Step 21. Remove the daughterboard

Remove the sub-board. It is glued to the frame with metalized tape, so to facilitate the process, the board can be heated a bit.

ℹ️️ The board contains a charging port (Micro USB), microphone, spring contacts for the speaker, vibration motor, and an antenna unit.

⚠️ It is not necessary to insert the tool under the board when removing the sub-board. Internal components could be damaged.


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Step 22. Remove the vibration motor

Pry and remove the vibration motor.


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Step 23. Remove the earpiece speaker

Pry and remove the earpiece (speaker).


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Step 24. In the display frame remained

Parts are in the frame of the display module.

Detailed disassembly instructions of Xiaomi Mi 9 in the video, made by our mobile repair & service center:

If you have a question, ask us, and we will try to answer in as much detail as possible. If this article was helpful for you, please rate it.


Disassembling\Repair has medium complexity and takes about 10 minutes in time. Our manual is suitable for all models Xiaomi Mi 9 — Xiaomi Mi 9 M1902F1G released for markets in different countries.



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