The FESCs are notorious for being easily shorted out if you touch or even think about touching the PCB while it has power. Do yours still have the clear plastic wrap on them? without it there is no protection from shorts from what I’ve seen on here.
I had to remove the plastic from mine to remove the heat sink so I coated it in conformal coating so that I wouldn’t accidentally short it. I still haven’t finished the enclosure for mine so if that isn’t the issue I can’t help much
I had a MOSFET fail for the onboard anti spark switch on mine, the power button lit up but did nothing. I removed the switch and made a loop key that seemed to work and turn the ESC on.
I do still have the plastic wrap on the vesc, I had to cut it open to free the power switch but this was only after the vesc had failed and it’s still wrapped around the majority of the esc
No Idea, Id make the loop key as they seem a pretty good idea anyway. Im very new to this so definitely worth seeing if someone with more experience can offer further advice.
I’m just not entirely sure how I would replace the built in antispark with a loopkey, is the ESC supposed to automatically turn on when power is applied and no switch is connected? How exactly did you bypass the built in switch?
Hmm, I think I might have a separate issue, plugging in the battery with an XT90S doesn’t seem to turn it on when the switch is removed, thank you very much for your help though.
I’m going to hail @aletheuo and @Gamer43 it seems you both have documentation on bypassing the mosfets on an fsesc, would bypassing the mosfets be a possible solution for this issue?
Resistance between phases. Should be 80kohms or so
Continuity on a 3.3v to gnd pin. Should not be short.
Continuity on a 5v to gnd pin. Should not be short.
And with it powered up
Voltage at the anti-spark mosfets. Does the battery voltage make it to the drain? (other side)?
** if no, you can try manually shorting the two switch pins to see if it does something different
I was Having similar issues turned out to be battery voltage was low and my vesc setting wouldn’t let it turn on due to the voltage in my battery being below or at the cut off point! And my charger was fried at the same time “when it rains it pours lol” ended up bypassing my bms and it turned on finally I’m a total noob but not to electronics and tinkering! just thought might be something to look into!