Disassembly/Repair of the mobile device Xiaomi RedMi 4X with each step description and the required set of tools.

Use an 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 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.

⚠ Look in advance in the picture for the location of the cables for inter-board, touchscreen, display, buttons (if any) under the cover to not damage them accidentally.

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

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 8 screws.

Remove the cover with 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.

Disconnect the battery connector as soon as possible.

ℹ️ The Xiaomi RedMi 4X has a battery BM47 with 4000 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.

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

Remove the loudspeaker assembly with antennas.

Carefully remove the battery.

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

ℹ️ The 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 under the board when removing the sub-board. Internal components could be damaged.

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

Disconnect the connector on the motherboard and remove the rear camera.

Pry up the connectors of the power volume buttons cable, display module cable, touchscreen cable.

Turn the motherboard over, disconnect the connectors of the inter-board cable, and coaxial cable from the inside and remove the PCB.

Carefully peel the cables back and remove the inter-board and coaxial cables.

Carefully remove the power/volume buttons cable.

Pry and remove the earpiece speaker.

Parts are in the frame of the display module.