Is it possible to brick a set of esc's in a hard crash? If so, is it possible to get them working again? I've got one out of 3 working, but that one I replaced because the motor didn't spin freely. Thought the others were fine, but no tones from them. When I arm the only motor that spins is the one with the replaced esc.
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I've "bricked" a esc after a hard crash. Everything looked fine but it wouldn't spin up the motor. Plugged into blheil and it was gone. Re-soldered all the connections still got nothing. Checked continuity nothing. Speedix ES35 didn't even break the heat shrink. It's a possibility but I don't think its very common.
Have you checked mosfets for continuity? If not then check that the fc didn't get jacked and not sending one output signal. Try switching another motor and esc to that fc output to confirm that the esc is bad. See if the motor output from one of the other fc channels works.
I had a hard smack recently and now motor #4 on my ESC is done for. I get continuity between the A and C pads, motor has Fet Drag when soldered, and the motor doesn't spin when armed and just jumps when throttled up. Its possible for one ESC in a 4n1 to "Brick" or die after a crash. I was using a Diatone Mamba 20x20 40a BLH32 ESC.
You can't brick an esc in a crash. Wrong firmware flash is about the only way to actually "brick" an esc. There may be another issue like mosfets to each esc. You'll see the motors but they won't spin up on the damaged channel.
Check in BLheli read setup see if it shows up