Samsung Galaxy A40 battery replacement repair guide

Your battery is no longer charging properly and is constantly empty.

  • Galaxy A40
  • 12 Steps
  • Medium
  • 60 min.
Go to the guide

New power ahead! Simply replace the battery of your Samsung Galaxy A40.

Your Galaxy A40 quits way too soon? Then simply replace the defective battery in your mobile phone with this manual. Compared to other Samsung smartphones, the Galaxy A40 has a plastic back cover, making it easier to remove. Afterwards, only the middle frame of the device needs to be removed and the battery is exposed and can be replaced.

If you have any questions during the repair or if you are stuck at a certain step, don't hesitate to contact us. Our iDoc technicians are happy to help! We are also always happy to receive feedback!

And now we wish you good luck with the repair and have fun with your almost new Galaxy A40!

Required tools

  • Flat Picks

    Flat Picks

    You need a very flat tool such as a flat pick to pry out parts that are glued in place.

    €2.00 at the iDoc store
  • Heat gun

    Heat gun

    You can use a heat gun to heat parts that are glued on so they’re easier to remove. In most cases, you can also use a hairdryer.

    from €14.47 on Amazon
  • iFlex opening tool

    iFlex opening tool

    Taking apart the little pieces in your smartphone can be a big pain. The iFlex is tough but compact with a blade thickness of just 0.15 mm so it fits into even the smallest spaces, like the gap between the display and frame or under the logic board. The iFlex is made of stainless steel and designed for a good grip, making this convenient tool the perfect assistant for every smartphone repair.

    €10.00 at the iDoc store
  • iSesamo

    iSesamo

    To remove the glued screen of your smartphone, you need a thin tool to separate the glue.

    €10.00 at the iDoc store
  • Tweezers

    Tweezers

    We recommend using tweezers to remove screws and various small parts from your device.

    €10.00 at the iDoc store
  • Plastic prying tool

    Plastic prying tool

    You need a flat plastic prying tool to disconnect the various plugs and connectors.

    €2.00 at the iDoc store
  • Suction cup

    Suction cup

    A suction cup is perfect for lifting smooth surfaces such as displays or rear glass panels.

    €2.00 at the iDoc store
  • Phillips PH00 screwdriver

    Phillips PH00 screwdriver

    You need the right screwdriver for removing PH00 screws.

    €13.00 at the iDoc store

Required replacement part

Show all replacement parts for the Galaxy A40 

Replacement parts and tools for this repair

Our tools plus the right spare part help you fix your device easily.

Getting started with the repair of your Galaxy A40

If you get stuck or have questions, you can post a comment. We’d be happy to help.

12 steps
  1. Switching of the Galaxy A40

    Galaxy A40 - Switching of the Galaxy A40 01
    Galaxy A40 - Switching of the Galaxy A40 02
    Galaxy A40 - Switching of the Galaxy A40 03
    1. Switch off your Galaxy A40 at the start of the repair.
    2. For this, hold down the standby button longer and confirm the shutdown on the screen.
  2. Removing the backcover

    Galaxy A40 - Removing the backcover 01
    Galaxy A40 - Removing the backcover 02
    Galaxy A40 - Removing the backcover 03
    Galaxy A40 - Removing the backcover 04
    Galaxy A40 - Removing the backcover 05
    Galaxy A40 - Removing the backcover 06
    Galaxy A40 - Removing the backcover 07
    Galaxy A40 - Removing the backcover 08
    Used tools
    Heat gun
    from €14.47

    The backcover of the Galaxy A40 is heavily glued along the entire edge. Heat the glue to make it easier to remove. The back cover is made of plastic and not glass, unlike many other Samsung Galaxy models. Therefore it does not break easily, which makes it easier to remove.

    1. Heat the edge with a heat gun or a normal hairdryer to about 60°C. Heat especially the area where you start to remove the back cover.

    As a rule of thumb, heat up to a point where you can still hold the appliance with your fingers.

    1. Place a suction cup on the back cover and pull on it while pressing the unit down. If a gap like this forms, you can insert a tool like the iFlex or a pick.

    Do not push the tool too far into the device to avoid damaging anything inside. Pay special attention to the cameras in the upper left corner.

    1. Then move your tool around the whole frame to gradually loosen the glue. Use flat picks to keep the already loosened part open.
    2. When the glue is loose, you can put the backcover aside.
    Used tools
    Heat gun
    from €14.47
  3. Removing the fingerprint sensor

    Galaxy A40 - Removing the fingerprint sensor 01
    Galaxy A40 - Removing the fingerprint sensor 02
    Galaxy A40 - Removing the fingerprint sensor 03
    Galaxy A40 - Removing the fingerprint sensor 04
    Galaxy A40 - Removing the fingerprint sensor 05
    Galaxy A40 - Removing the fingerprint sensor 06
    • Fingerprint connector

    Next, remove the fingerprint sensor, which is loosely placed on the mid frame and connected to the motherboard with a connector.

    1. Loosen the plastic cover over the connector with tweezers.
    2. Then carefully separate the connector with a spudger.
    3. Then remove the fingerprint sensor.
  4. Removing the midframe

    Galaxy A40 - Removing the midframe 01
    Galaxy A40 - Removing the midframe 02
    Galaxy A40 - Removing the midframe 03
    Galaxy A40 - Removing the midframe 04
    Galaxy A40 - Removing the midframe 05
    Galaxy A40 - Removing the midframe 06
    Galaxy A40 - Removing the midframe 07
    Galaxy A40 - Removing the midframe 08
    Galaxy A40 - Removing the midframe 09
    Used tools
    • 13 × 3,4 mm Phillips
    1. The middle frame is secured with several screws. In addition, multiple clips attach the display to the frame.
    2. First loosen all screws and remove the SIM card holder.
    3. Then slide a plectrum between the frame and the display and release all clips one by one.
    4. If the plectrum does not work so well, you can also try to get into the gap with your fingernail.
    5. Loosen the display from the frame along the entire edge and put the frame aside.
    Used tools
  5. Disconnecting the battery and removing the flex cable

    Galaxy A40 - Disconnecting the battery and removing the flex cable 01
    Galaxy A40 - Disconnecting the battery and removing the flex cable 02
    Galaxy A40 - Disconnecting the battery and removing the flex cable 03
    Galaxy A40 - Disconnecting the battery and removing the flex cable 04
    Galaxy A40 - Disconnecting the battery and removing the flex cable 05
    Galaxy A40 - Disconnecting the battery and removing the flex cable 06
    • Battery Connector
    • Flex Cable Connector
    1. Disconnect the battery contact from the main board.
    2. Disconnect the connectors of the wide flex cable that goes over the battery.
    3. Put the flex cable aside.
  6. Removing the battery

    Galaxy A40 - Removing the battery 01
    Galaxy A40 - Removing the battery 02
    Galaxy A40 - Removing the battery 03
    Galaxy A40 - Removing the battery 04
    Galaxy A40 - Removing the battery 05
    Galaxy A40 - Removing the battery 06
    Galaxy A40 - Removing the battery 07
    Galaxy A40 - Removing the battery 08
    Used tools
    1. The battery is glued to the back of the display unit over a large area. You can use hot air to make it easier to remove the battery again.

    But never heat the battery directly! Heat the entire unit from the side of the screen.

    1. Then lever with a thin tool like the iSesamo or a battery spudger at the edge of the battery.
    2. Do not pry at the upper edge where the connector is located, as the battery controller could be damaged there.
    3. If the battery can be lifted slightly, use a tool to remove all the glue underneath the battery.
    4. Then remove the battery.
    Used tools
  7. The right tools for your repair

    With the right tools, you will succeed in any repair. In our store you will find a large selection of professional quality tools.
    VIEW NOW
  8. Preparing the new battery

    Galaxy A40 - Preparing the new battery 01

    If your replacement battery has an adhesive surface, remove the protective film over it before inserting it.
    If your battery does not have an adhesive surface, you can use thin double-sided adhesive tape to attach the battery. Make sure that the battery is not pushed upwards by too thick an adhesive.
    You can also use universal adhesive tape from the iDoc Store. Cut them to size first, then stick them to the back of the battery.


  9. Installing the battery

    Galaxy A40 - Installing the battery 01
    Galaxy A40 - Installing the battery 02
    Galaxy A40 - Installing the battery 03
    1. Now insert the battery back into the device.
    2. Make sure that the adhesive underneath doesn't wrinkle.
    3. Place the battery into the device making sure it has enough space on all sides.
    4. Press it down a little so that the adhesive bonds again.
  10. Connecting the battery and installing the flex cable

    Galaxy A40 - Connecting the battery and installing the flex cable 01
    Galaxy A40 - Connecting the battery and installing the flex cable 02
    Galaxy A40 - Connecting the battery and installing the flex cable 03
    Galaxy A40 - Connecting the battery and installing the flex cable 04
    Galaxy A40 - Connecting the battery and installing the flex cable 05
    • Flex Cable Connector
    • Battery Connector
    1. Put the wide flex cable back into the device.
    2. Then connect the two connectors of the flex cable to the mainboard and to the USB board.
    3. Last reconnect the battery again.
  11. Installing the midframe

    Galaxy A40 - Installing the midframe 01
    Galaxy A40 - Installing the midframe 02
    Galaxy A40 - Installing the midframe 03
    Galaxy A40 - Installing the midframe 04
    • 13 × 3,4 mm Phillips
    1. Now place the center frame back on the display.
    2. Press it down all the way around so that all the clips reattach.
    3. Then fasten all screws.
    4. Put the SIM and SD card holder back into the device.
  12. Installing the fingerprint sensor

    Galaxy A40 - Installing the fingerprint sensor 01
    Galaxy A40 - Installing the fingerprint sensor 02
    Galaxy A40 - Installing the fingerprint sensor 03
    Galaxy A40 - Installing the fingerprint sensor 04
    • Fingerprint connector
    1. Put the fingerprint sensor back in its place.
    2. Then connect the connector and put the plastic cover back on.
    3. Press the cover down slightly until it clicks into position.
  13. Installing the backcover

    Galaxy A40 - Installing the backcover 01
    Galaxy A40 - Installing the backcover 02
    Galaxy A40 - Installing the backcover 03
    Galaxy A40 - Installing the backcover 04
    Galaxy A40 - Installing the backcover 05
    Galaxy A40 - Installing the backcover 06
    1. To reattach the backcover, you can either reuse the old glue or attach a new adhesive frame.
    2. If you want to use the old glue, make sure that it is evenly distributed everywhere and does not wrinkle or protrude anywhere.
    3. To apply a new adhesive frame, you must first remove the old glue from the back cover and the frame.
    4. Use tweezers to remove the glue. You can also scrape it off with a plastic tool or rub it off with a lint-free cloth and some rubbing alcohol.
    5. Place the new adhesive frame on the frame of the device and remove all protective films. Make sure that no glue sticks out of the frame.
    6. Then put the back cover back on and press it down all the way around.
    7. Heat the frame of the back cover again with hot air and weigh the smartphone down with a few books to allow the glue to bond better.
Ø 5 (2 Ratings)

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