⚠️ Before disassembling, do not forget to turn your phone off.
Disassembly/Repair of the mobile device Samsung Galaxy A31 SM-A315 with each step description and the required set of tools.
Step 2. Remove the tray
Use the Key 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.
ℹ️️ Remember the location for the SIM and Memory card (Micro SD) trays so that nothing is confused when reassembling.
⚠️ 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 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.
Step 4. Unscrew the screws
Using a screwdriver (Phillips 1.5 mm PH000), unscrew the 15 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.
Step 5. Open the middle cover
Remove the cover with a loudspeaker and 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.
ℹ️️ On the cover, you can see the metalized coating on the plastic in the form of tracks and contact pads. These are Wi-Fi, Bluetooth, and GPS antennas.
⚠️ It is crucial while reassembling, checking the spring contacts on the board, and the contact pads on the cover match and touch. Otherwise, signal loss or signal may be quite weak.
Step 6. Disconnect the battery connector
Disconnect the battery connector as soon as possible.
ℹ️️ The Samsung Galaxy A31 SM-A315 model has a battery EB-BA315ABY 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 7. Remove the inter-board cable
Disconnect the connectors of the coaxial cable , fingerprint sensor, inter-board cable. After, remove the inter-board cable.
Step 8. Unscrew one screw
Using a screwdriver (Phillips 1.5 mm PH000), unscrew one screw securing the sub-board.
Step 9. Remove the daughterboard
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.
ℹ️️ The board contains a charging port (Micro USB), microphone, headphone jack socket, 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.
Step 10. Remove the cameras
Disconnect the connectors and remove one front (selfie) camera and one rear camera.
Step 11. Unscrew one screw
Using a screwdriver (Phillips 1.5 mm PH000), unscrew one screw securing the motherboard.
Step 12. 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.
Detailed disassembly instructions of Samsung Galaxy A31 SM-A315 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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