There are a few things you can check
continuity on a 3.3v pin to ground
continuity on a 5v pin to ground
continuity on that 2 pin V+/GND. That’s after the anti-spark system so it’s useful for checking shorts on the power stage
Hold the power button and feel if precharge resistors (the three big resistors marked “1000”) are getting hot. Recommended to use a CC/CV power supply to watch amps, and limit power into the ESC.
If any of those are short, it helps narrow down what failed.