⚠️️ Before disassembling, do not forget to turn your phone off.
Disassembly/Repair of the mobile device Xiaomi 12 Lite (Xiaomi 12 Lite 2203129G) with each step description and the required set of tools.
Step 2. 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 cards 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.
Step 3. Open the back cover
We need to heat the surface of the back cover to a temperature of about 65-70 ° C or 160 ° F. For this we use a heating mat you can use a hair dryer.
And after 5-7 minutes we can proceed to open the back cover.
The back cover is slightly recessed so we have to use a thin metal tool to lift one edge. We pry up the edge so that we can slip the plastic film through. And then we start working with the plastic film to detach the back cover.
We have to be careful around the area of the cameras so that we don't damage the lenses.
Step 4. Unscrew the screws
Okay, and we move on to unscrewing the eleven screws, we use a Phillips 1.5mm or #000 screwdriver.
The screws are all the same, but we still recommend placing them on a special surface in an easy to remember order for reassembly.
Step 5. Open the cover
Pry over the edges. Move an opening tool along the edge detach the clips and remove the cover with transmission lines and pads for antenna.
⚠️️ There is a connector on the cover located on the inside!
ℹ️️ Try to lift the cover by the edges and not push anything between them to not accidentally touch or short-circuit anything on the circuit board.
Step 6. Disconnect the battery connector
Disconnect the battery connector as soon as you can. Use a non-metallic or plastic tool to avoid any damage.
ℹ️️ The Xiaomi 12 Lite 2203129G model has a battery BP4B with a capacity of 4300 mAh (also known as a rechargeable battery).
Step 7. Unscrew the screws
And we move on to unscrewing the six black and two small silver screws at the bottom. The screwdriver is the same 1.5 mm Phillips screwdriver. We unscrew the screws and place them on a special surface in order to better remember for reassembly.
The screws are well magnetic, so it is not difficult to unscrew them.
Step 8. Remove the loudspeaker
After unscrewing the screws, we proceed to detach the cover. Carefully hook the cover by the edge and lift it. In this place there is an intricate arrangement of connectors and coaxial cable. So, we need to turn the board over, release the coaxial cable and disconnect the cable connector on the motherboard.
Step 9. Disconnect the connector
Disconnect the connector on the small board and remove the cover with a loudspeaker, coaxial cable.
Step 10. Remove the inter-board cable
Disconnect the connectors on the motherboard and sub-board and remove the inter-board cable with the holder of sim cards.
⚠️️ 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.
Step 13. 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.
The sub-board is well recessed into the frame and secured. We need to carefully lift it up and pull it out.
We have to be careful and take our time so as not to damage the fingerprint sensor or its cable.
After, we take out the sub-board and turn it over.
Step 14. Disconnect the connector
As we can see on the inside, we have a coaxial cable connected. We need to disconnect the connector of the coaxial cable and detach the cable itself, which is fixed on the sub-board.
On the sub-board we have the microphone and charging port.
Step 15. Disconnect the connectors
Disconnect the display module cable connector and the coaxial cable connector.
Step 16. Remove the cameras
We move on to detach the cameras. We start with the front camera, carefully pry up the edge and remove the camera with a copper thermal conductive foil. After that we detach the rear cameras. It is better to hold the cameras so that they do not fly out and do not damage the lenses.
Step 17. 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.
⚠️️ 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.
Step 18. Remove the battery
Finally, we move on to detach the battery.
We need to unwrap the brown tabs with the letters A and B and read on the tabs which one we need to pull. And as it became clear from the description, we need to pull the wide tab A.
With one hand we hold the display frame and with the other hand we gently pull upwards, detaching the battery.
As we can see the battery is also held on the transparent protective coating that protects the display frame.
Step 19. In the display frame remained
ℹ️️ In the display frame remained: the earpiece speaker, fingerprint sensor, coaxial cable, side buttons, and vibration motor.
Detailed disassembly instructions of Xiaomi 12 Lite in the video, made by our mobile repair & service center:
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