Using a screwdriver (Star Shape 0.8mm Pentalobe), unscrew the two screws at the end of the phone.
Disassembly/Repair of the mobile device Xiaomi RedMi Note 4 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 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.
Step 3. Open the back cover
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.
⚠️️ Pay attention to the fingerprint sensor cable located on the inside.
Step 5. Remove the fingerprint sensor
Carefully remove the cable with fingerprint sensor from the back cover.
Step 6. Disconnect the battery connector
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 RedMi Note 4 model has a battery BN41 with 4100 mAh capacity (aka rechargeable battery).
⚠️️ It is highly recommended to disconnect the connector to avoid possible short circuits during disassembly.
Step 9. Remove the battery
With extreme care, remove the battery because it is glued from the inside by the manufacturer.
Step 10. Remove the daughterboard
Disconnect the inter-board cable, touchscreen cable on the daughterboard.
Remove the sub-board. It may be glued to the frame or attached with attachments like latches or hooks, so be careful.
ℹ️️ 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.
Step 11. Unscrew the screws
Using a screwdriver (Phillips 1.5 mm PH000), unscrew the eight screws and remove the bracket holding the vibration motor.
Step 12. Disconnect the connectors
Pry up the connector of the side buttons cable, display 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.
Step 13. 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 15. Remove the coaxial cable
Pry carefully and remove the coaxial cable and power / volume buttons.
Step 16. Remove the earpiece speaker
Pry at the bottom and remove the earpiece speaker.
⚠️️ Be careful! The earpiece speaker is glued a bit with adhesive.
⚠️️ If we pry the speaker in the middle we may break the earpiece speaker in half.
Pry at the bottom and remove the vibration motor.
⚠️️ Be careful! The vibration motor is glued a bit with adhesive.
Detailed disassembly instructions of Xiaomi RedMi Note 4 in the video, made by our mobile repair & service center:
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