Galaxy S21 FE 5G - Replacing the battery

Use our checklist to test the basic functions of your Galaxy S21 FE 5G before repairing. This way you can check afterwards if your repair was successful.

1. Press and hold the side and volume down button simultaneously for a few seconds. You can also switch off your Galaxy via quick access.
2. Tap on Power off in the displayed menu.

Once you open your device its specified IP68 certification will expire.

1. Heat the edge of the back cover by running the hot air device evenly over it.

As an alternative to the suction cup, we can recommend the iSclack, which requires less force to lift up the back cover.

The iFlex can be inserted particularly well between the back cover and the screen unit due to its sharp edges.

1. Attach a suction cup to the lower edge of the back cover and pull it upwards to create a narrow gap.
2. At the same time, insert a flat tool into the gap between the back cover and the screen unit.

To avoid damaging the camera module, you should not insert your tool too far.

In order to prevent the glue of the back cover from bonding again, we recommend sliding flat plastic picks under the back cover at regular intervals.

1. Drive your tool completely around the edge of the back cover to loosen it piece by piece.
2. Put the detached back cover aside.

• 9 × 3.8 mm Phillips

We recommend using a screw storage to keep all disassembled parts and screws safe and organized. Our magnetic pad has the additional advantage that nothing can move on it.

A small arrow as well as a notch show you where you can place your levering tool best.

1. Loosen the nine Phillips screws that secure the plastic cover above the motherboard.
2. Then carefully lever the cover out of its guide with a spudger.

• Connector

To avoid a potential short circuit during the repair, you should always detach the battery connector first.

1. Fold the loosened board cover around.
2. Carefully disconnect the orange battery connector and black charging coil connector with a spudger from the motherboard.
3. Pull the glued end of the cover off the speaker.

• 6 × 3.8 mm Phillips

1. Loosen the six Phillips screws that hold the speaker in place.
2. Carefully lever the speaker out of its guide and set it aside.

• Connector

The screen cable of the S21 FE 5G can be fully removed. The lower part of the cable is connected to a separate slot that sits somewhat recessed in the screen unit.

1. Carefully separate the two connectors of the screen cable with a spudger.
2. Take the disconnected cable out of your device.

• Connector

1. Separate the two connecting cables from the motherboard and the USB board with a spudger.
2. Put the disconnected cables aside.

The battery of the S21 FE 5G is heavily glued into the display unit. In order to loosen it safely, you need to heat up the glue in advance.

Never heat the sensitive battery directly, but only from the display side.

1. Heat the battery by running a hot air gun evenly over the corresponding opposite area on the screen.

The battery can be loosened particularly well if you move the iPlastix under the battery with a knife movement.

1. Place a battery spudger on the lower edge of the battery and carefully lift it upwards.
2. Remove the detached battery from the device.
3. Insert the flat iPlastix under the battery at the lifted edge and detach the battery bit by bit from the bottom of the screen unit.

1. If necessary, bend the battery connector, so that it can be pressed well onto the slot on the motherboard.
2. Remove the protective films from the front and back of the battery.

1. Put the replacement battery back into its guide and press it firmly.

• Connector

The cable labeling will help you align them in the device.

Never attach connectors by force. Damage can lead to the failure of an entire component.

1. Align the two connecting cables one after the other in the device and attach their two connectors on the USB and motherboard each.

• Connector

The cable labeling will help you align it in the device.

1. Align the screen cable in the device and attach its two connectors on the motherboard and the separate slot in the screen unit.

• 6 × 3.8 mm Phillips

1. Put the speaker back in its original position.
2. Screw it in place with the six Phillips screws.

• Connector

Always connect the battery last to avoid a potential short circuit.

1. Align the charging coil above your device.
2. Connect the black charging coil connector and the orange battery connector to the motherboard.

• 9 × 3.8 mm Phillips

1. Place the board cover in its guide. It must sit level all over.
2. Reattach its glued end to the speaker.
3. Screw the cover in place with the nine Phillips screws.

Before you close your iPhone 13 for good, we recommend testing the replacement screen as well as other basic functions of your phone. Again, use our checklist for this or the internal Samsung test menu, which you call up via the code *#0*#.

If something doesn't work properly, double-check that everything is installed and connected correctly.

1. Connect your Galaxy to the mains in order to see if the replacement battery is charging.
2. Also place it on a wireless charger, if available, to check the wireless charging function.

If the adhesive frame is still in good condition, you do not need to install a new one. However, if it has defects or no longer sticks properly, we recommend that you use a new adhesive frame. On our YouTube channel you can find a detailed video on the topic.

1. Peel off the carrier film from the bottom of the adhesive frame and press it onto the edge of the back cover. A spudger can help you with this.
2. Now carefully peel off the remaining protective film from the top of the adhesive frame.

We recommend that you run hot air over the edge of the back cover again, so that the glue bonds properly. You can also weigh down your device with books for a few minutes.

1. Close your Galaxy S21 FE 5G after the repair by pressing the back cover back onto the screen unit.