SpeedyBee ESC repair - Mosfts replace- full video 

A very likely chance, many esc experience the same problem

@@Breakingcarbon Okay.. So i was testing my quad indoors and crashed into a pillow on the bed so I immediately disarmed it and then motors started making some weird tone so I got it to my desk and checked everything was ok and then the moment I armed it there was a spark which freaked me out and rest is history.

They do a little move while activated

Your version is correct?

solder out one serviceable one and measure its capacitance

@@TheFruitcake1983 thanks for the tip. Soldered some new condensators on the esc but it didn’t worked. The fc will get the power so i believe it can only be the power circuit for the MCU. Dont know how to fix that :/

@@MJ-mw3ni Did they break on impact? If so, the cracks could be either in the board or in the active components. I have fixed my problem now because the GND leg on the connector burned off or broke off inside the board after a fall.

@@TheFruitcake1983 after a crash i didn’t saw any further damage under the microscope beside 2 broken capacitors. Maybe the pcb go some hits. Do you think there could be some high voltage spikes destroying further components? There also no shorts on the Esc and the resistant is equal to any motor output.

@@MJ-mw3ni Anything can happen after shocks, cracked capacitors could have shorted out etc.

Me too, dont know which mosfet to find exactly key world searching to buy.

I took a similar ESC

And also what was the issue? Why did they broke? Was it factory defect?

@@nazarkokhan mosfets on drone esc's burn out when there is a sudden spike in voltage and or current and those voltages/currents are too high for the mosfet to deal with causing it to get hotter and hotter untill it completely melts itself - these spikes happen when the motors are pushed to their limt during extreme flight manovers , as for your first question , he used the mosfets from the 3rd 4 in 1 esc (the one with no burnt mosfets ) these boards are called doner boards and used its mosfets to replace the burnt ones - hoope this helps

My recommendation is to use KESTER solder with flux For flux I didn’t have some recommendation