Disassembly/Repair of the mobile device Xiaomi RedMi Note 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.

Disconnect the battery connector as soon as possible.

ℹ️️ The Xiaomi Redmi Note 4X model has a battery BN43 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.

Disconnect the connector and remove the fingerprint sensor.

Carefully remove the battery.

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

Remove the loudspeaker assembly with antennas.

Using a screwdriver (Philips 1.5 mm PH000), unscrew one screw securing the sub-board.

Disconnect the coaxial cable connector, cable to the mainboard, and remove 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).

Using a screwdriver (Phillips 1.5 mm cross-head), unscrew 4 screws.

ℹ️️ Be sure to note the location of the screws before disassembling. When assembling the device, screwing the screw in the wrong place may damage the device or its part. To avoid damage, the removed screws and individual pieces (as gaskets or brackets) must be laid out in the appropriate order, or the screws and their holes in the phone must be marked with colored markers.

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.

Pry up the connector on the motherboard and remove the main camera.

Pry up the connectors of power volume buttons cable, display module cable, touchscreen sensor 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 cross-head), unscrew 5 screws.

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

⚠️ 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.

Carefully remove the earpiece speaker and coaxial cable.

Parts in the frame of the display module.