I was working on a voltage divider to measure battery voltage with an ESP32. Unfortunately, during testing, there was a short circuit between the + and - terminals due to a stray wire that I didn’t notice. As a result, some components burned out and are no longer part of the circuit. These components are labeled D1, D2, and D3 in the image.
I’m not sure if this is the right place to ask, but can someone help me understand the function of these diodes? I've tested the power bank with a 12V water pump, and it still works. However, since I’m planning to use this as a battery backup for a solar panel setup, I’d like to know what protection function might have been lost, and if I can repair it by soldering replacement diodes myself.
To be honest, I can't, probably they are, or probably they are not, if there is a way to be sure of that I don't know it
Because the wires get really hot almost meld, a smoke came from the box, and when I open it, the place where were this diades are smoked and the dioedes weren't there, I will attach an image asap when I arrive home.
Thanks for the advice. I'll try to repair it as soon as I can figure out what type of diodes they were and their voltage and current ratings. Unfortunately, since they are burned and I don't have the original schematic, it's hard to know exactly what to replace them with.
On the other hand... isn't weird 3 diodes burn if they are in series? I thought as soon as the first diode burnt, the next and previous are on a "open circuit line" and can't get current so they act also as a fuse, Or could it be that the excessive heat from the first diode burning caused the other two to desolder themselves?
There may be many other components that are damaged. I would take out the batteries and save them for a future project and throw the rest in the trash.
