Disassembly/Repair of the mobile device Xiaomi Mi A1 (Xiaomi Mi A1 MDG2) with each step description and the required set of tools.

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.

Using a screwdriver (precision star-shaped 0.8 mm aka Pentalobe), unscrew/drive 2 screws out at the end of the phone.

Using a spudger or a plastic pick, carefully, around the edge, detach the back cover clips, and remove it.

Do not insert the tool deeply or bend it. Otherwise, the housing may be tampered with or damaged.

⚠️️ Be careful when opening the cover from the volume and power buttons side. Thin cable and fragile buttons are straightforward to damage.

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

ℹ️️ The Xiaomi Mi A1 model has a battery BN31 with 3000 mAh capacity (aka rechargeable battery).

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

Pry up the connector and remove the fingerprint sensor.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 6 screws.

Pry over the edge and remove the assembly with a loudspeaker and vibration motor.

Disconnect the coaxial cable connector, cable to the mainboard on the daughterboard.

⚠️️ 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).

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

The sub-board, also, may be attached with attachments like latches or hooks, be careful.

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

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

Pry up the connectors of power volume buttons cable, display module cable, inter-board cable, and coaxial cable.

⚠️️ 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.

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 7 screws.

Disconnect the connectors on the motherboard, and remove the assembly of the two rear cameras.

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.

To remove the battery we have to use a thin plastic film for separation. To facilitate the process, we can use isopropyl alcohol. It is often the most difficult to pass the tool between the parts to be divided. Choose the far side of the flat cables.

⚠️️ Do not use a lever or any force for separation that could damage the elements inside (flat cables on the sides).

⚠️️ Do not let the liquid get inside the smartphone.

ℹ️️ In the display frame remained: the earpiece speaker.