Yesterday I built 2 superbee boards in parallel.
That means I soldered motor 1 on board A, then motor 1 on board B, then 3A, 3B... to spread out the heat and make sure not to sink too much into one area of the board at once
Therefore both boards received the same amount of heat
I then powered up each board on my current limiting lab power supply - As I took the habit of; having blown many fets on the first lipo plug.
Board A was 100% fine, all ESC working
Board B on the other hand, had one FET shorted on every one of the 4 ESCs
I was gutted
Tried flashing Bluejay in hopes that a different commutation does anything, but no beans.
Then I remembered a previous case of a esc with the same affliction mysteriously fixing itself after applying current limited power and jerking the motor testing slider for a while
So I figured I would try on ESC 1; didn't work.
I increased the motor startup power and protection and tried again
And what do you know, after a dozen attempts, the motor suddenly started and was now happily spinning, showing even heat between all fets
I couldn't believe it, so I tried again on ESC 2
Well you've guessed it, same thing, motor eventually unlocked and started as well
That's when I decided to setup the camera to record it live
In the video you can see the 2 remaining fets getting fixed the same way.
I do not understand how I was able to fix them this way; did the heat reflow a possible paste short beneath the fets?
Did it rearrange the silicon inside the fet?!
I am no electronics engineer, all I know is that this damn looks like a repeatable method to unfuck these faulty SIA517DJ escs that tend to blow on the first plug-in, on the Diamond and Superbee boards mostly.