My drone has a problem with one of the motors turning at full sqeed, this happens when power is plugged in, system switched on or off. When turned on, The lights on the bottom flash and never stop. The other motors never start turning ever when the throttle is advanced.
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Most likely, one channel of the motor controller has blown and shorted out.
Repairing the failed channel doesn't look feasible, since the entire controller costs just $20 or so.
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Try having a look at the control board inside, is there any corrosion or water on the board?
If its corroded then it may be repairable with a soldering iron lots of propyl and steady hand.
If there is water on the board dab it dry with a paper towel and leave the cover off for a while in front of a fan to let it dry out.
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