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Disassembly of the mobile device Samsung Galaxy M31 SM-M315 with each step description and the required set of tools.

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How to disassemble Samsung Galaxy M31 SM-M315, Step 1/1

Step 1. Before disassembling!

⚠️ Before disassembling, do not forget to turn your phone off.

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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.

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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.

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

⚠️ Pay attention to the fingerprint sensor cable glued to the back cover from the inside.

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Step 4. Remove the fingerprint sensor

Disconnect the connector and remove the fingerprint sensor.

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Step 5. Unscrew the screws

Using a screwdriver (Phillips 1.5 mm PH000), unscrew 7 screws.

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Step 6. Open the cover

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.

ℹ️️ On the upper 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.

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Step 7. Disconnect the battery connector

Disconnect the battery connector as soon as possible.

ℹ️️ The Samsung Galaxy M31 SM-M315 model has a battery EB-BM207ABY with 6000 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.

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Step 8. Unscrew the screws

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

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Step 9. Open the cover

Remove the cover protecting the daughterboard (aka sub-board). Try to lift the cover by the edges and do not push anything between the cover and PCB to not accidentally touch or short-circuit anything on the board.

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Step 10. Remove the inter-board cables

Carefully, preferably from the edge, disconnect the connectors and remove the inter-board cables connecting the mainboard to the daughterboard (also known as the sub-board).

⚠️ 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.

ℹ️️ An arrow on the FFC cable (flexible flat cable) indicates its correct position.

How to disassemble Samsung Galaxy M31 SM-M315, Step 11/1

Step 11. Disconnect the connector

Disconnect the coaxial cable connector.

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Step 12. 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, vibration motor, 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.

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Step 13. Remove the cameras

Disconnect the connectors and remove one rear camera and one front (selfie) camera.

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Step 14. Unscrew one screw

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

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Step 15. Disconnect the connectors

Disconnect the coaxial cable connector and connector of the power and volume -/+ buttons.

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Step 16. 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.

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Step 17. Remove the cameras

Disconnect connectors and remove the assembly of three rear cameras.

Detailed disassembly instructions of Samsung Galaxy M31 SM-M315 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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Disassembling\Repair has easy complexity and takes about 12 minutes in time. Our manual is suitable for all models Samsung Galaxy M31 SM-M315 released for markets in different countries.



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