Galaxy A51 - Replacing the screen

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.

1. Now turn your A51 upside down with the screen facing up.
2. Attach a suction cup to the lower edge of the display and pull it upwards.
3. At the same time insert a flat, stable tool between the display unit and the center frame to create a gap. We use the iFlex initially, and then the iPlastix.

The iPlastix is particularly suitable for loosening the middle frame. It is made of sturdy, flexible plastic, so you can insert it easily without scratching the edge of the display. The easiest way to detach the display unit from the middle frame is to insert the iPlastix into one of the two corners at the bottom edge of the display.

Take care not to insert your tool too deeply to avoid damaging anything on the inside of the display unit.

1. Run the tool once around the display edge and press it upwards to release the plastic lugs of the middle frame.
2. Put the middle frame away and the display unit in front of you with the display screen facing down.

• 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.

• Connector
• 1 × 3.0 mm Phillips

The mobile phone antenna cable is attached to the mainboard. With a Phillips screw the board is connected to the display unit.

1. First loosen the antenna cable from the board by carefully lifting the metal head of the cable upwards with a pair of tweezers.
2. Take the detached antenna cable out of its guide and then loosen the single screw of the mainboard.
3. You can easily remove the loosened mainboard from your device with your fingers.

After removing the mainboard, the slightly glued earpiece can be removed from the display unit.

1. Insert a pair of tweezers into the small opening on the right side of the earpiece and carefully lever the component out of its guide in the display unit.

• Connector

Before the USB board can be removed, the display connector must be detached first.

When detaching the display connector, 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 a plastic spudger to attach to the display connector and carefully lift it off.

• Connector
• 2 × 2.9 mm Phillips

The fingerprint sensor must also be removed before the USB board can be removed.

When detaching the connector of the fingerprint sensor, 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 plastic spudger to gently lever the fingerprint sensor connector off the USB board.
2. Remove the two Phillips screws that attach the sensor to the USB board and then take it out.

If the display connector and the fingerprint sensor are disconnected, the USB board can be removed.

1. Use a spudger to gently lift the USB board from the display unit and put it aside.

Before you can install your replacement display, you must prepare it.

1. First remove all existing protective foils and seals from the new display.
2. Then compare the replacement display with your old display to check whether any small components still need to be taken over.

Now you can reinstall all removed components one after the other.

Since we did not install a new replacement display for this manual, the following photos show the old display unit with adhesive residues.

1. Start by placing the USB board in its original position and press it slightly.

• Connector
• 2 × 2.9 mm Phillips

Now insert the fingerprint sensor again.

Never press the connector forcefully. Its damage may cause a complete breakdown of the fingerprint sensor.

1. Place the sensor in its original position on the USB board.
2. Attach the connector of the sensor by pressing it firmly until you feel it click into place.
3. Screw the fingerprint sensor to the USB board with two Phillips screws.

• Connector

Once the fingerprint sensor is back in place, you can also reconnect the display.

1. Now attach the display connector by gently pressing it until you feel it click into place.

Before installing the mainboard, the earpiece must be inserted.

1. Put it back into its guide at the upper edge of the display and slightly press it.

The shape of the guide will help you to align the earpiece correctly.

• Connector
• 1 × 3.0 mm Phillips

At this point you can insert the mainboard into the new display of your Galaxy A51.

1. Put it back to its original position and fix it with the previously loosened screw.
2. Using tweezers, push the antenna cable back into its guide at the edge of the display.
3. Then attach the connector of the antenna cable to the mainboard.

The replacement display for the Galaxy A51 does not come with new adhesive strips to attach the battery. Usually, the adhesive residues on the back of the battery are sufficient to fix the battery securely in the display unit.

Make sure that the adhesive residues do not form thick lumps. Clumped adhesive residues lead to uneven, unstable positioning of the battery and can have a negative effect on the entire device.

If you want to be on the safe side, you can completely remove the adhesive residue and apply thin, double-sided adhesive tape to the back of the battery. We use our universal adhesive tape for this.

1. Place the battery in its guide in the display unit and press it firmly so that the adhesive bonds.

• 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.

Before you close your Galaxy A51 with the back cover again, you should attach a new adhesive frame. This way you make sure that it is closed properly.

1. First remove all remains of the old adhesive frame from the inside of the back cover.
2. Align the new frame with the back cover on trial.

The corners of the adhesive frame are different and will help you align it correctly.

1. Once the frame is correctly aligned, you can pull off the first protective film from the frame's bottom and press the frame on the edge of the back cover.

A spudger will help you to attach the frame as smooth as possible.

1. Now remove the two protective films from the top of the adhesive frame.
2. Finally, remove the protective film from the edge as well, so that only the black adhesive film remains on the edge of the back cover.

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.