endotherm
Captain
Flight distance : 503241 ft
Australia
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Don't open it if it is under warranty, you will invalidate it. There is nothing inside that is relevant to your fault anyway. You can see inside the motor from the top. It should look like shiny copper wire coils covered in clear lacquer. If they are black, they are probably burning out due to being overloaded. If one is black and the others aren't, you probably have a problem. The best test is to use your nose, does it smell like burned electronics? It was sold as a refurb, they don't manufacture these any more, so it is likely to be a refurb. That's not a bad thing, it has had someone look over it closely and had everything renewed to as brand new with a full warranty. I'd be contacting DJI for a warranty repair if I were you, they will pay for transport and fix it under warranty.
Sometimes you can burn the motors out due to pilot error, e.g. a hard landing clipping the ground or other object, or completely flipping it. Be aware the aircraft flight recorder will have data that DJI can read to establish if it is your fault or a warranty issue, and if you are unlucky they may charge you for the repair (they will quote you first). Motors aren't very expensive and it should be an easy exchange for them. You don't want it falling out of the sky because you cheaped out on this do you? Also if it subsequently fails after the warranty runs out, it could potentially burn out the main board which is a rather expensive repair. A loose motor screw is less of a problem than an overly tight screw or using a long screw. Overtightening can crack the plastic arms, while excessively long screws can contact the coils in the motors and cause a short and damage the motor. Long screws are usually a problem associated with using prop guards. The current draw shown on AirData isn't necessarily because of a bad motor, it could be it was flown hard that flight or was overcoming strong winds. It will show the current draw of ALL motors and electronics, so it isn't much of a diagnostic tool, especially if it was data from just one flight.
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