Galaxy A40 - Replacing the screen

  • Galaxy A40
  • 19 Steps
  • Medium
  • 60 min.
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The touch screen no longer works, the display has visual errors or the glass is cracked.

Your Samsung Galaxy A40 fell down and now the display is broken? Fortunately the Galaxy A40 is quite easy to repair. The back cover is not made of glass, but of plastic compared to other Samsung models, making it much easier to open. The back cover doesn't scratch or break as easily during this procedure and is a bit more flexible and bendable.

Be sure to check your spare part for transport damage or other defects before repair. If something is not in order, do not use the spare part, but exchange it directly.

If you get stuck at any point of the repair, you can always contact our support. We will be happy to help you. Simply use the chat function or write a comment beneath the instructions. We are also happy to receive feedback!

And now good luck with the repair!

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

    Opening your smartphone can be a very delicate operation, especially if the glue is very persistent. The blade of the flexible but sturdy iFlex measures just 0.15 mm, so it fits in even the smallest gaps, such as between the screen and the frame. The practical iFlex is made of stainless steel and sits comfortably in the hand. This makes it the perfect assistant for every smartphone repair.

    €10.00 at the iDoc store
  • iSesamo

    iSesamo

    If you want to remove the glued screen from your smartphone, you will need a narrow tool to separate the glue. With a solid but flat metal tip and a non-slip grip, the iSesamo is an effective support for the work with a plectrum.

    €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.

19 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

    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
  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

    • 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.
  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. Removing the mainboard of the Galaxy A40

    Galaxy A40 - Removing the mainboard of the Galaxy A40 01
    Galaxy A40 - Removing the mainboard of the Galaxy A40 02
    Galaxy A40 - Removing the mainboard of the Galaxy A40 03
    Galaxy A40 - Removing the mainboard of the Galaxy A40 04
    Galaxy A40 - Removing the mainboard of the Galaxy A40 05
    Galaxy A40 - Removing the mainboard of the Galaxy A40 06
    • 1 × 2,9 mm Phillips
    • Antenna Connector
    1. In the next step, remove the main circuit board.
    2. Separate the contact of the blue antenna by moving a pair of tweezers under the cable and levering it slightly.
    3. Remove the single Phillips screw.
    4. The screw is shorter than the ones of the middle frame. Be careful not to mix them up.
    5. Then lift up the board and take it out of the device.
  8. Removing the vibration motor and the earpiece

    Galaxy A40 - Removing the vibration motor and the earpiece 01
    Galaxy A40 - Removing the vibration motor and the earpiece 02
    Galaxy A40 - Removing the vibration motor and the earpiece 03
    Galaxy A40 - Removing the vibration motor and the earpiece 04
    Galaxy A40 - Removing the vibration motor and the earpiece 05
    Galaxy A40 - Removing the vibration motor and the earpiece 06
    Galaxy A40 - Removing the vibration motor and the earpiece 07
    1. The vibration motor and the earpiece will also need to be transferred to the new display unit. Both are slightly glued.
    2. Heat the glue and lever the vibration motor and the earpiece out of the device.

    Take care not to bend the golden contacts of the vibration motor, otherwise they can break off.

  9. Removing the USB board

    • 1 × 2,9 mm Phillips
    • Antenna Connector
    • Connector
    1. On the lower board is the USB charging socket, the headphone output and other components such as microphones and antennas.
    2. Disconnect the connector and the blue antenna cable from the lower circuit board.
    3. Loosen the screw and then remove the circuit board from the device.
    4. Also remove the blue antenna cable running along the side.
  10. 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
  11. Preparing the new Galaxy A40 replacement screen

    Galaxy A40 - Preparing the new Galaxy A40 replacement screen 01
    Galaxy A40 - Preparing the new Galaxy A40 replacement screen 02
    Galaxy A40 - Preparing the new Galaxy A40 replacement screen 03
    Galaxy A40 - Preparing the new Galaxy A40 replacement screen 04
    1. Now compare your old display with the new spare part and if necessary, take over the missing small parts.
    2. With an original Samsung replacement display from iDoc, you don't have to take over anything.
    3. Remove all protective films before you start assembling. The foils protect the front camera opening and the thermal pads under the motherboard.
  12. Installing the USB board

    Galaxy A40 -  Installing the USB board 01
    Galaxy A40 -  Installing the USB board 02
    Galaxy A40 -  Installing the USB board 03
    Galaxy A40 -  Installing the USB board 04
    Galaxy A40 -  Installing the USB board 05
    Galaxy A40 -  Installing the USB board 06
    Galaxy A40 -  Installing the USB board 07
    • 1 × 2,9 mm Phillips
    • Antenna Connector
    • Connector
    1. First place the blue antenna cable in the lateral guide in the frame of the display.
    2. Then insert the USB board back into the device. Make sure that the adhesive surface on the bottom is still on the board.
    3. Then reconnect the connector. It should snap into place with a slight click.
    4. Finally connect the contact of the antenna. Position the contact with a pair of tweezers over its connector on the board and press it down with a spudger.
  13. Installing the vibration motor and the earpiece

    Galaxy A40 - Installing the vibration motor and the earpiece 01
    Galaxy A40 - Installing the vibration motor and the earpiece 02
    1. Put the vibration motor back into the device and press it down lightly.
    2. Then put the earpiece back in place.

  14. Installing the mainboard

    Galaxy A40 - Installing the mainboard 01
    Galaxy A40 - Installing the mainboard 02
    Galaxy A40 - Installing the mainboard 03
    • Antenna Connector
    • 1 × 2,9 mm Phillips
    1. Put the mainboard back into the unit.
    2. Fasten it with the single screw and reconnect the antenna.
  15. 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.
  16. 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.
  17. 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.
  18. 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.
  19. Testing the Galaxy A40

    Galaxy A40 - Testing the Galaxy A40 01
    Galaxy A40 - Testing the Galaxy A40 02
    Galaxy A40 - Testing the Galaxy A40 03
    Galaxy A40 - Testing the Galaxy A40 04
    Before you finally close the Galaxy A40 you should test it properly.
    1. Start the device and open the phone app to test the device.
    2. Samsung smartphones have a hidden test menu that can be used to check various functions of the device.
    3. Type the key combination *#0*# in the dial pad and the menu opens.
    4. Now test whether the touch screen works in all places. You can also test all other functions, such as earcup, loudspeaker, etc.
  20. 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 (3 Ratings)

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