Hi, today I just finished my drone and I was going to try it. I tried it, and when I throttle I saw that it did not take off, now I know it was because I had put the propellers wrong.

So, at that time I didn't know and I was testing and in one of those I gave full throttle for less than a sec to see if it was that I was not giving enough.

However, when I did it something failed, now a motor doesn't work and the rest when I test them in Betaflight (1) they move clumsily, I mean, they move and stop and move again until they seem to work normally, also while they are working I can listen some beeps. Also when connecting the battery, the beeps that sound at the beginning now sound weak (2).

I don't understand what's the problem, when I gave full throttle it was less than a second, I don't think I burned it. I've checked and there is no continuity in the ESCs. I don't think that it could have been damaged the ESC by doing that.

I have tried to go from DShot600 to dshot300 and nothing changed.

Videos to illustrate the problems (1) and (2).


(1)

(2)

FC and ESC: MAMBA F405 Betaflight Flight Controller F40 40A 3-6S DSHOT600 FPV Racing Brushless ESC

Motors: Racerstar 2205 2300kv


I've checked the soldering and it seems fine.



BLHeli recognizes all 4 ESCs.

Thanks in advance.

Although spinning motors on the bench with no props can sometimes yield some odd behaviour due to no load or air mode being enabled, spinning them directly from the motors tab should cause them to spin up normally. So that is starting to look like an ESC problem to me.

If you try to spin the motors one at a time rather than all together, what happens? Do you get the same erratic behaviour, and the same non-spinning motor at position #1?

When you applied full throttle with the props incorrectly fitted, did any of the props hit the ground and stop spinning because of that? If so then doing so can fry/damage the ESC and/or motor due to the immense current draw caused by resistance that prevent the motors from spinning (i.e. prop blades dug into the ground).

Regarding the non-spinning motor, you have nothing to lose by swapping it over with one of the other motors and see of the same motor still doesn't spin when soldered to a different set of ESC pads, and vice versa, check to see if the known working motor continues to spin when connected to the suspect ESC pads. That will help to clarify whether it's an ESC or motor issue.

As a last ditch effort it might be worth reflashing the latest version of Betaflight to the flight controller (with full chip erase switched on) and also reflash the latest version of the BLHeli firmware to all 4 of the ESCs. Then set the ESC protocol to DSHOT in Betaflight and test spinning the motors again from the motors tab without changing any other Betaflight or BLHeli settings. This is just in case you have/had some odd setting somewhere that is causing the motor behaviour you are seeing.

So, I tried what you said about spinning the motors one by one, and you were right, the motors work fine except the one that I mentioned that doen't move. I swapped the motor and worked fine on the other ESC pads, so the motor is fine and the motor 1 pads of the ESC is the problem.

I checked continuity in the mosfets and I can't find the problem, I have other ESC so maybe I could swap some of them.

What tests can I do to find the problem ion the ESC? There's a chance I can solve it swapping mosfets?

When I tested the drone (when it worked fine), the props DID hit the ground a bit but they didn't get stuck so I don't know if that could be the issue.

Thanks.

Unfortunately there is no easy way to test why an ESC might be misbehaving. It could be the FETs, the MCU, or any of the supporting components that may have failed. Testing some of those components would also require them to be removed from the board so not a task for the faint-hearted.

If you have a proper rework station and the skills to remove and re-solder those tiny FETs then you could of course try doing that, but it may be more agro than it's worth unless you want to embark an a learning exercise.

If you decide to do that, please let us know how you get on.

It would certainly be worth testing all motors with another ESC just to confirm that they are all indeed OK (or not). Then you can concentrate your efforts on the ESCs.

Before you give up. Double check the signal cable. Sometimes just a bend pin or the cable is not making good connection.

Can always swap position of esc's as you did the motor and see if the problem follows.
As Voodoo mentioned, it could be a cold joint that came loose after the full throttle so double check/rework the solder joints could be worth a try.