Teardown difficulty:
Moderate
Duration:
6 min

Recommended tools

Disassembly of the mobile device Samsung Galaxy A40 SM-A405 (Samsung SM-A405F/DS, SM-A405FN/DS (Global), SM-A405FM/DS) with each step description and the required set of tools.


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Step 1. 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.


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Step 2. 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.

⚠️️ Be careful! The fingerprint sensor is attached to the middle cover but is glued slightly to the back cover with adhesive.


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Step 3. Remove the bracket

Pry up the edge and remove the bracket holding the fingerprint sensor connector.


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Step 4. Remove the fingerprint sensor

Pry up the connector, detach and remove the fingerprint sensor.


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Step 5. Unscrew the screws

Using a screwdriver (Philips 1.5 mm PH000), unscrew 13 screws.


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Step 6. Open the middle cover

Pry around the edges. Move an opening tool along the edge detaching the clips and remove the middle cover with a loudspeaker and antenna pads and tracks. The middle cover protects the printed circuit boards (PCBs).

Try to lift the cover by the edges and don't push anything too far inside, so as not to accidentally break or short-circuit anything on the circuit boards.


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Step 7. Disconnect the battery connector

Disconnect the battery connector as soon as possible.

ℹ️️ The Samsung Galaxy A40 SM-A405 model has a battery EB-BA405ABE with 3100 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. Remove the inter-board cable

Carefully, preferably from the edge, disconnect the connectors and remove the inter-board cable 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.


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Step 9. Disconnect the connectors

Disconnect the coaxial cable connector, cable to the display module 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).


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Step 10. Unscrew one screw

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


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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 and antenna units.

⚠️️ It is not necessary to insert the tool underneath when removing the sub-board. Internal components could be damaged.


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Step 12. Remove the front camera

Pry it over the edge, disconnect the connector and remove the front (selfie) camera.


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Step 13. Disconnect the connector

Pry up the coaxial cable connector.


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Step 14. Unscrew one screw

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


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Step 15. 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.

⚠️️ 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 16. Remove the rear camera

Pry over the edges, disconnect connectors and remove the two rear cameras assembly.

Detailed disassembly instructions of Samsung Galaxy A40 SM-A405 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.


Disassembling\Repair has medium complexity and takes about 6 minutes in time. Our manual is suitable for all models Samsung Galaxy A40 SM-A405 — Samsung SM-A405F/DS, SM-A405FN/DS (Global), SM-A405FM/DS released for markets in different countries.



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