Galaxy A51 - Replacing the battery

We recommend that you use our checklist to test the basic functions of your phone before repair. This way you can rule out the possibility that anything has been damaged during the repair. Afterwards you have to switch off your A51 to avoid a potential short circuit.

1. To do this, first press and hold the side and volume down key simultaneously for a few seconds.
2. Tap on "Switch off" in the displayed menu.
3. Your phone will now shut down completely within a few seconds.

The Galaxy A51 is opened via the firmly adhered plastic back cover. To remove it, you first have to heat the adhesive film with hot air. Use a hot air device such as a heat gun or a regular hair dryer.

1. First, place your phone face down on a soft, clean surface.
2. Move the hot air device evenly over the edge of the back cover.

A rule of thumb: The edge of the back cover should only be heated up to a point where you can still touch it without getting your fingers burned.The top and bottom edges of the back cover are glued especially tightly together.

Once the edge of the back cover has warmed up sufficiently, you can start to carefully remove it from the middle frame.

Opening the Galaxy A51 will void the manufacturer's warranty.

1. Place a suction cup in the lower part of the back cover and pull it slowly upwards to create a narrow gap between back cover and middle frame.
2. At the same time try to insert a flat, stable tool into the gap and enlarge it. We recommend the iFlex and flat plastic picks for this.

The iFlex is made of very thin, stable metal and has sharp edges.To avoid scratching the frame of your device, we recommend that you start with the iFlex at this stage and continue as early as possible with a flat plastic pick.The easiest way to insert the tool is to place it in one of the two corners of the lower frame of your device.

Be careful not to insert your tool too far into the device to avoid damaging components.

1. Once a gap is created, remove the back cover from the middle frame piece by piece by moving the tool along the edge of the back cover.
2. Press it upwards at the same time to release it from the middle frame.

At regular intervals, place flat picks at the loosened points of the back cover frame so that the adhesive cannot rebond. For this, turn the picks from the pointed side to their broad side.

1. One the back cover is entirely detached, put it aside.

• 13 × 3.5 mm Phillips

The middle frame is not glued, but firmly hooked into the display unit with plastic lugs.

1. First loosen all screws that fix the middle frame to the display with a Phillips screwdriver.

For the storage of loosened screws and small components it is advisable to use a screw storage box. We recommend our magnetic pad for this purpose. On this pad, the removed components can be arranged in the same way as they were installed in the telephone.

1. In the next step, remove the SIM tray from the middle frame by pressing with a SIM tool, or another pointed object into the small round opening next to it.

• Connector

To prevent a short circuit during the repair, you must disconnect the battery from the mainboard as soon as possible.

When detaching the battery connector make sure that you start from the side where there are no small components on the board. This will prevent possible damage.

1. Use a sturdy plastic lever tool to slide under the battery connector and carefully lift it off. We recommend a handy plastic spudger for this purpose.

• Connector

Above the battery runs a flex cable that connects the mainboard and the USB board.

When detaching the flex cable connectors make sure that you start from the side where there are no small components on the board. This way you avoid possible damage.

1. Use the plastic spudger to move under the flex cable connectors one after the other, and carefully lift them off.
2. Then put the detached flex cable aside.

The battery is glued in the display unit over a wide area. In order to remove it, you must first heat the glue with hot air.

Never heat the heat-sensitive battery directly, but always from the side of the display only .When removing the battery, take care not to bend it or damage it otherwise.

1. Turn your phone upside down with the display facing up and move hot air evenly over the area where the battery is located.
2. Turn the display unit over again and use a sturdy plastic tool to slide it under one edge of the battery to gently lift it up. We use the battery spudger for this.
3. If the battery is slightly loosened, you can use a flat, flexible tool such as the iPlastix to slide it under the battery to completely detach it from the display unit.

The replacement battery for the Galaxy A51 is already supplied with adhesive strips on the back. With these strips the battery can be securely attached to the display unit.

1. To make sure that the new battery sits flush in the unit, first remove all adhesive residues from the inside of the display.
2. Then remove all protective films from the adhesive surfaces of the replacement battery.
3. Insert the new battery into its guide in the display unit and press it firmly so that the adhesive bonds evenly everywhere.

• Connector

After inserting the battery, the flex cable can be connected.

1. Align the flex cable.

The labels Main and Sub on the cable help you to align it correctly.

1. Attach one connector each on the mainboard and the USB board.

• Connector

Once the battery is inserted and the flex cable connected, the battery can be connected.

1. Attach the battery connector by gently pressing it down.

• 12 × 3.5 mm Phillips

Once the battery is connected, the middle frame can be installed.

Take care to align the middle frame correctly. The recess for the camera can be used for orientation.

1. Place the middle frame on the display unit and press it firmly so that it locks into place from all sides.
2. Then slide the SIM tray into the middle frame of your Galaxy A51.

The printing on the SIM tray must point towards display.

If the SIM tray does not slide in easily, the mainboard may not be seated properly.

1. Finally fix the middle frame to the display unit with the Phillips screws.

Before you glue the back cover of your A51 again, you should test the functionality of the replacement display.

1. Switch on your phone and enter *#0*# in the number field to access the Samsung test menu.
2. For example, test whether the new display shows the colors correctly and whether the touch works everywhere on the display.

You can also test other components, such as the vibration motor and speakers.

1. If everything works as expected, you can close the device. If not, check again if everything is properly installed and connected.

Once the repair is complete, you still have to attach the back cover including a new adhesive frame to close your Samsung Galaxy A51.

1. Position the back cover over the display unit and the middle frame.
2. Press it evenly by running your fingers once along the entire edge of the back cover.
3. Finally, heat the back cover again, and weigh it down for half an hour with some books, so that the glue can bond firmly again.