Disassembly/Repair of the mobile device Xiaomi Mi Mix 2S (Xiaomi Mi Mix 2S M1803D5XA) with each step description and the required set of tools.

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.

ℹ️ 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.

⚠️ Pay attention to the fingerprint sensor cable! The cable connects the fingerprint sensor on the back cover to the motherboard.

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

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

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

ℹ️ The Xiaomi Mi Mix 2S model has a battery BM3B with 3300 mAh capacity (aka rechargeable battery).

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

Pry up the fingerprint sensor connector and remove the back cover.

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

Using a screwdriver (Philips 1.5 mm PH #000), unscrew the five screws.

Using a screwdriver (Philips 1.5 mm PH #000), unscrew the two short screws.

Disconnect the coaxial cable connector. Pry over the edges and remove the loudspeaker assembly with a coaxial cable.

Disconnect the coaxial cable connector, inter-board cable connector, connector to the LED light sensor.

⚠️ 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 or attached with attachments like latches or hooks, so be careful.

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

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

With extreme care, remove the battery because it is glued from the inside by the manufacturer.

Also, we need to remember or look in advance at the location of the flat cables under the battery, so as not to damage them.

Pry up the connectors of the side buttons cable, display module cable, inter-board cable, front camera 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.

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.

Pry up the connector and remove the assembly of the two rear cameras.

Carefully peel off the long flat cable with a front (selfie) camera.

ℹ️ In the display frame remained: the vibration motor, earpiece speaker, coaxial cable.