Umair Gaines
Braun electric toothbrushes are popular oral hygiene devices but they can be tricky to repair. While some users opt to send their brushes for professional servicing, others attempt DIY fixes, particularly for battery issues. Online guides and videos offer step-by-step instructions for dismantling and repairing Braun toothbrushes, including battery replacement. However, it's important to note that opening waterproof devices may damage their waterproof seals. Before attempting any repairs, users should carefully consider the risks and benefits, and decide whether professional servicing is a more suitable option.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Brand | Braun/Oral-B |
| Model Numbers | 3754, 3756, Vitality, Professional Care, PRO, TriZone 600, 1000, 2000, 3000 |
| Common Issue | Battery replacement |
| Battery Replacement Difficulty | Difficult but not impossible |
| Repair Options | Send to Braun/Oral-B Authorized Service Center, follow online guides and videos, contact Braun for advice |
| Battery Replacement Tools | Small soldering iron, temperature-controlled soldering station, small adjustable spanner |
| Battery Characteristics | 42mm or 49mm in length, higher electrical capacity (mAh) with increased length |
| Charging Recommendation | Only charge the amount used each brush |
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What You'll Learn
Removing the old battery
Braun electric toothbrushes are designed to be unrepairable, and you cannot open them without destroying them. The manufacturer does not support replacing the batteries, and they are sealed to keep the unit watertight.
However, if you are willing to attempt replacing the battery, you will need a small adjustable spanner and a soldering iron.
First, place the spanner around the flat of the white plastic part of the toothbrush and twist it anticlockwise. After twisting about 30 degrees, the white plastic should disengage from the main body of the toothbrush. Once released, the inner mechanism should slide out easily. Take care not to lose the spring at the bottom of the mechanism (inside the copper coil). Set aside the main body and the spring, as these will be needed again when reassembling the toothbrush.
On one side of the mechanism is the PCB (Printed Circuit Board), which controls the charging of the cell (battery) and drives the motor. De-solder the four tabs that hold the PCB and cell in position. Two of the tabs go to the motor, and the other two go to the positive and negative of the cell. The negative tab on the cell needs to be bent up to enable the PCB to be removed. Once this is done, the PCB can be lifted away, and the cell can be slid out of the body of the mechanism.
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Purchasing a new battery
Braun electric toothbrush batteries can be replaced, and there are guides available online to help you do this. However, it is important to identify the precise model of your toothbrush before purchasing a new battery. Braun Oral-B has used the same marketing and model names across its range of toothbrushes, so the model names cannot be used to identify your toothbrush. Instead, you should use the \"Type\" number, which can be found on the bottom of the toothbrush handle.
Once you have identified the type of toothbrush you have, you can purchase a replacement battery. Some guides recommend measuring your current battery and, if it is 42mm long, purchasing a longer, higher-capacity 49mm battery.
You can find replacement batteries online or at electronics repair shops. When purchasing a new battery, it is important to consider the quality of the PCB (Printed Circuit Board) in your toothbrush. The PCB controls the charging of the cell (battery) and drives the motor. It is recommended to use a temperature-controlled soldering station when repairing electronics, as it can be difficult to delaminate the traces by overheating with a soldering iron.
It is also important to consider the safety and reliability of the replacement battery. Ensure that you purchase a battery that is compatible with your toothbrush model and follow the instructions carefully during the replacement process.
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Dismantling the toothbrush
Start by placing the small adjustable spanner around the flat white plastic part of the toothbrush. Twist the spanner anticlockwise until you feel some resistance. You should only need to twist it about 30 degrees. At this point, the white plastic component should disengage from the main body of the toothbrush. Be gentle and take your time with this step to avoid damaging the internal components.
Once the white plastic section is removed, carefully set aside the main body and the spring, as these won't be needed until you reassemble the toothbrush. Inside, you will find the inner mechanism, which should slide out easily. Be cautious not to lose the spring at the bottom of the mechanism, which is inside the copper coil.
Now, you will see the Printed Circuit Board (PCB). The PCB controls the charging of the cell (battery) and drives the motor. It also has a momentary push button near the top. To remove the PCB, you will need to desolder the four tabs that hold it in place. Two of these tabs connect to the motor, while the other two connect to the positive and negative ends of the cell. Pay close attention to this step to avoid damaging the PCB or any other components.
After desoldering, gently bend the negative tab on the cell upwards to create some space. This will allow you to lift the PCB away from the rest of the mechanism. With the PCB removed, the cell (battery) can now be slid out of the body of the mechanism. Take note of the battery's dimensions, as you may have the option to upgrade to a longer, higher-capacity battery if it measures 42mm.
At this point, your Braun electric toothbrush has been successfully dismantled, and you can now proceed with any necessary repairs or replacements. Remember to keep all the parts organized and safe so that you can reassemble the toothbrush correctly.
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Soldering and de-soldering
To begin the process of repairing a Braun electric toothbrush, the inner workings of the toothbrush must be exposed. This can be done by using a small adjustable spanner and twisting it anticlockwise around the flat of the white plastic part of the toothbrush. Once the white plastic is disengaged from the main body, the inner mechanism can be carefully removed.
The next step is to remove the power switch plate by carefully unclipping it from both sides. Now, the soldering iron can be used to de-solder the two battery terminals on the circuit board, starting with the negative one nearest the coil of copper wire. A desoldering pump can be used to make this process easier and to prevent melting the plastic battery compartment. Once the battery terminals are de-soldered, the metal tabs can be bent vertical and away from the board with a knife, ensuring no solder is left joining the solder tag to the board.
After de-soldering, the PCB can be removed, and the old battery can be replaced with a new one. It is important to measure the old battery and choose a new battery of the same physical dimensions or modify the plastic housing to accept a longer, higher-capacity battery.
Finally, the toothbrush can be reassembled by placing the PCB back into position and soldering the tabs that hold it in place. The two parts of the toothbrush body can then be pressed together firmly until they snap into place.
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Reassembling the toothbrush
Firstly, retrieve the main body and the spring that were set aside earlier. Ensure the spring is securely in place at the bottom of the mechanism, inside the copper coil. Then, slide the inner mechanism back into the main body of the toothbrush.
Next, place the white plastic part back onto the toothbrush handle. Using a small adjustable spanner, twist the white plastic part clockwise until it engages and locks into place with the main body of the toothbrush.
Now, it's time to reassemble the PCB (Printed Circuit Board). Solder the four tabs that hold the PCB and the cell in position. Make sure to use a temperature-controlled soldering iron and take care not to overheat the traces. Two of the tabs connect to the motor, while the other two connect to the positive and negative sides of the cell.
Before securing the PCB, ensure the switch on the PCB is aligned with the button molding on the outside of the case. Once aligned, press the two parts firmly together. They should snap together securely.
Finally, place the toothbrush on its charging cradle momentarily to re-energize the internal chip. And that's it! Your Braun electric toothbrush should now be fully reassembled and functional.
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Frequently asked questions
Braun electric toothbrushes are designed to be unrepairable and you cannot open them without destroying them. However, some users have replaced the battery in their Braun electric toothbrushes by dismantling the toothbrush, desoldering the PCB (printed circuit board), and removing the battery.
To open your Braun electric toothbrush without destroying it, place a small adjustable spanner around the flat of the white plastic part of the toothbrush and twist the spanner anticlockwise. After twisting about 30 degrees, the white plastic should disengage from the main body of the toothbrush.
If you are unable to fix your Braun electric toothbrush, you can send it to a Braun/Oral-B Authorized Service Center for service at your own cost. You can find the details of your closest service center at service.oralb.com.
