⚠️ Before disassembling, do not forget to turn your phone off.
Disassembly of the mobile device Realme C21Y (Realme C21Y RMX3261) 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
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.
ℹ️️ 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 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.
Step 6. Disconnect the battery connector
Disconnect the battery connector as soon as possible.
ℹ️️ The Realme C21Y RMX3261 model has a battery BLP729 with 5000 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.
Step 10. Disconnect the connectors
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).
Step 11. Remove the daughterboard
Remove the sub-board. It is glued to the frame with metalized tape, so to facilitate the process, the sub-board can be heated a bit.
ℹ️️ The sub-board contains a charging port (Micro USB), microphone, headphone jack socket, 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.
Step 12. Remove the battery
Remove the battery. We need to pull the green tag up to unstick the battery.
Do not forget to disconnect the battery connector at Step 6!
Step 13. Remove the cameras
Pry up the connectors of the display module cable, inter-board cable, and coaxial cable.
Moreover, disconnect the connectors and remove three rear cameras and one front (selfie) camera.
⚠️ 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 14. Remove the motherboard
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.
Step 15. In the display frame remained
ℹ️️ In the display frame remained: the earpiece speaker, coaxial cable, and vibration motor.
Detailed disassembly instructions of Realme C21Y in the video, made by our mobile repair & service center:
If you have a question, ask us, and we will try to answer in as much detail as possible. If this article was helpful for you, please rate it.
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