Galaxy A40 - Replacing the battery

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.

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.

• 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.

• 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.

• 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.

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.

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.

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.

• 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.

• 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.

• 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.

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.