One morning when I was getting ready to go to work I noticed that my toothbrush suddenly stopped working, my Aquasonic toothbrush remained silent and didn’t do anything after pressing the button.
I remember charging it just a day before but nothing happened except complete silence. I decided to pull the charger apart to see for myself what the problem was and to fix it.
By the way, I also uploaded a short video about this topic on YouTube and may want to watch it first before you continue reading this article. You can also watch the video below.
There are 3 possible causes of this problem: battery, on/off switch or PCB, or the motor.
3 Reasons Why Aquasonic Toothbrush Not Turning On Not Working
I finally found three possible problems online and started to see if they were causing issues, here is how I fixed my Aquasonic toothbrush not working.
1. Battery Problem
If your Aquasonic toothbrush is acting up it might be because of a dead battery that doesn’t charge anymore. To test that I opened the toothbrush apart to access its battery which is secured inside the toothbrush securely.
The toothbrush can be opened by removing the bottom charging base and then sliding the whole circuit out.
Then I inspected to see if the battery had swollen which if it had needed replacing, luckily mine was fine so I tested its voltage using a multimeter.
If you detect a voltage that is far below 3.7V, the battery might be dead and replacing the battery can fix the issue for you, but luckily my battery health seemed fine and something else was causing the brush to not work.
I also made a video about this topic and you can watch it below. On the video, I used a multimeter to check if its battery is working fine. I was able to fix the problem by soldering the broken red wire connecting the battery.
2. On/Off Switch or PCB Problem
As my battery turned out to be fine I tried testing the on and off switch to see if it was the problem.
After manually pressing the button I couldn’t get the Aquasonic toothbrush to work no matter how hard I tried pressing it, it only meant one thing that my toothbrush’s PCB was at fault and only a professional repairman could fix the issue.
If you also find that your battery is at 3.7V but pressing the button doesn’t start the toothbrush then your PCB might be faulty.
3. Motor Problem
The last possibility of my Aquasonic electric toothbrush not working could be that the motor itself had stopped working.
To test this, I created a test scenario where I used 3 AA batteries and connected them together to simulate a 3.7V of current. Then I powered the motor directly using this power output to see if my motor was working fine or not.
As soon as I connected the motor directly to my artificial power output the motor came back to life and it was clear that the motor worked fine and the problem was isolated to a PCB or board issue.
