Tina said her toothbrush was having a hard time turning on. If she moved it around it would sometimes start, but not all the time. I found a guide on iFixit and decided to improve on it. While inside the toothbrush, I found a crappy solder lead that was the positive connection from the battery to the board. After heating the pad and flowing new solder to the board, it seems to be working well again.

Should the erratic button business continue, I will order a new button and pop it on, there’s easy access to the board for this repair. Also, I bathed the board in alcohol at the button, so that could be helping things too. Button replacement is also documented at iFixit.

For opening the toothbrush, I removed the head and then used a putty knife to pop the top off. It takes a little bit of muscle and the plastic will get dinged up, but it seems happy working again.