Teardown difficulty:
Moderate
Duration:
16 min

Recommended tools

Disassembly/Repair of the mobile device Xiaomi Mi 9 Lite (Xiaomi Mi 9 Lite M1904F3BG) with each step description and the required set of tools.


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How to disassemble Xiaomi Mi 9 Lite, Step 1/1 How to disassemble Xiaomi Mi 9 Lite, 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.

⚠ī¸ī¸ 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.


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

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.

ℹī¸ī¸ 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 the 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.


How to disassemble Xiaomi Mi 9 Lite, Step 3/1 How to disassemble Xiaomi Mi 9 Lite, Step 3/2

Step 3. Unscrew the screws

Using a screwdriver (Phillips 1.5 mm PH #000), unscrew the eleven screws.


How to disassemble Xiaomi Mi 9 Lite, Step 4/1 How to disassemble Xiaomi Mi 9 Lite, Step 4/2

Step 4. Open the cover

Pry over the edges. Move an opening tool along the edge detach the clips and remove the cover with antenna pads and tracks.


How to disassemble Xiaomi Mi 9 Lite, Step 5/1 How to disassemble Xiaomi Mi 9 Lite, Step 5/2

Step 5. Disconnect the battery connector

Disconnect the battery connector as soon as possible. It is better to use a non-metal or plastic tool to avoid any damage.

ℹī¸ī¸ The Xiaomi Mi 9 Lite model has a battery BM4F with 3940 mAh capacity (aka rechargeable battery).

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


How to disassemble Xiaomi Mi 9 Lite, Step 6/1 How to disassemble Xiaomi Mi 9 Lite, Step 6/2

Step 6. Unscrew the screws

Using a screwdriver (Phillips 1.5 mm PH #000), unscrew the eight screws.


How to disassemble Xiaomi Mi 9 Lite, Step 7/1 How to disassemble Xiaomi Mi 9 Lite, Step 7/2

Step 7. Remove the loudspeaker

Pry over the edge and remove the loudspeaker assembly.


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Step 8. Remove the inter-board cable

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

⚠ī¸ī¸ 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.

ℹī¸ī¸ An arrow on the FFC cable (flexible flat cable) indicates its correct position.


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

Step 9. Unscrew one screw

Using a screwdriver (Philips 1.5 mm PH #000), unscrew one screw securing the sub-board.


How to disassemble Xiaomi Mi 9 Lite, Step 10/1

Step 10. Disconnect the connectors

Disconnect the coaxial cable connector, fingerprint sensor cable connector.

⚠ī¸ī¸ Do not pull on the cable or pry it with a sharp tool, the connectors are pretty weak and break easily, or the cable falls out of the end (lug).


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Step 11. Remove the daughterboard

Remove the sub-board. It may be glued to the frame or attached with attachments like latches or hooks, so be careful.

ℹī¸ī¸ The sub-board contains a charging port (Micro-USB), microphone, spring contacts for the speaker, vibration motor, and an antenna unit.

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


How to disassemble Xiaomi Mi 9 Lite, Step 12/1 How to disassemble Xiaomi Mi 9 Lite, Step 12/2

Step 12. Remove the front camera

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


How to disassemble Xiaomi Mi 9 Lite, Step 13/1 How to disassemble Xiaomi Mi 9 Lite, Step 13/2

Step 13. Disconnect the connectors

Pry up the connectors of the display module cable, sensor cable, and coaxial cable.

⚠ī¸ī¸ 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.


How to disassemble Xiaomi Mi 9 Lite, Step 14/1 How to disassemble Xiaomi Mi 9 Lite, Step 14/2

Step 14. Remove the motherboard

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

The motherboard, also, may be attached with attachments like latches or hooks, be careful.

⚠ī¸ī¸ 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.


How to disassemble Xiaomi Mi 9 Lite, Step 15/1 How to disassemble Xiaomi Mi 9 Lite, Step 15/2

Step 15. Remove the cameras

Disconnect connectors on the motehrboard, and remove the assembly of three rear cameras.

Detailed disassembly instructions of Xiaomi Mi 9 Lite 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 16 minutes in time. Our manual is suitable for all models Xiaomi Mi 9 Lite — Xiaomi Mi 9 Lite M1904F3BG released for markets in different countries.



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