MicroPython Forum (Archive)

In a previous post I asked if my board was broken and it seems that it might be. I accidentally plugged the positive terminal of a 9v battery into the 3v3 pin instead of the V+ pin. The red, blue and yellow lights are on (dimly). It does not show up as a removable drive, and it doesn't show up as a serial device. I was hoping to get some insight on how to fix it, if at all possible. If not, lesson learned I suppose. Thanks in advance.

Here is a picture of the board: https://imgur.com/R0WSlNQ

Ouch! but maybe, depending how much effort you want to invest, it can be fixed. One of the ICs on the board took the brunt of the overvoltage and fused internally. If you connect an external power supply set for 3.3 volts directly to the 3.3v bus and progressively turn up the current limit towards 1 A, one of the ICs will become very HOT!. This is the damaged IC that you need to replace. If you're lucky it is a voltage regulator, if you're not so lucky it is the microcontroller.

RealSparky, the hardware guy