So I have a TRAMPA battery pack. For testing I connected it to my Flipsky motor controller with the provided 8 pin connector (where one of the ADC pins were connected to a main power switch I presume, based on some documents I found). Then smoke came out of my VESC. No motor was connected at this point.
After unplugging the 8 pin (uart communication) cable I re-powered the VESC. Now a red LED is blinking and VESC tool reports bad driver.
Looking at the board I found 2 hot spots (voltage injection with current limited power supply). Both IC were labelled as LG33. After some googling I found them to be MIC5231-3.3YM5-TR. Replaced them but the 2nd next to a big CPU was still getting hot. The caps around the CPU were also shorted. De-soldered the CPU then all the shorts were gone. Soldered on a new CPU, the power regulator chip is now happy, 3.3V rail is good. Getting a firmware on it is still in progress.
But now I got a new hot spot and I am struggling to find the part number of the bad components.
I see 2 suspicious diodes labelled as:
- AE, probably an SMAJ transient voltage suppressor?
- K210, probably a shottky diode but I get too many vague results
You can see them on the screenshots.
Anyone has a schematic or could give me advice? I would appreciate it. Should I just buy a new one? What did I do wrong?
Bottom of the board:
Top side of the board: