Recent content by indoctrin8ed

Quick update - I ordered replacement motors but wont have time to install until next week. I purchased a Phantom 4 to get me through the weekend. I hope it's less fragile. I'm placing my bets (unfortunately) on the board being bad because the motor shows 0.6 ohms across all winding sets -...

Hunch: I get about 0.6 ohms for all motors, including the "bad" one.

Vertigo, I set my scope to trigger on a voltage higher than 0.25 volts then capture the next 1 second. Nothing happens. Starting up the motor has to start with some input voltage. I suppose if it's an open circuit then the motor controller could sense that and not even try. So your point is...

Hunch: I will measure resistance per your suggestion when I get home in a couple hours - what should I expect to see? Trackman1: What will that typically cost to send to DJI to repair? I plan on swapping in a good motor but hoping to learn and share these diagnostic steps to help resolve these...

So my next questions is - assuming this is a bad board, what are my best options for getting a replacement? This is a P2A 2.7k with LightBridge. I'd like to avoid paying top dollar from DJI - are there reputable/reliable options for purchasing refurbished? Is it simply a desolder remove and...

So I have not yet had time to swap in a new motor, or put in a replacement motor, but I did put a scope on the red/black leads of a working motor and observed the signal (see picture attached). This makes total sense as the voltage is (+) when pulling the motor magnet towards the winding, then...

Ok - are motors a regular "wear item" in these things? Good idea to have spares on hand? Are they often damaged in crashes? Just asking because maybe I should order several of them? I'm surprised DJI doesn't have a connector harness for the motors.

Ok, I will swap motors and see what happens. Are you saying that there are only two serviceable parts in this thing (for the flying portion of it)? The mainboard and the motors?

That makes sense on the inductive/reactance side, but should I at least see a spike in input voltage on startup? I'm not an expert in motor controllers. Swapping motors does seem like a logical troubleshooting step, just hesitated prior to desoldering because the motor physically looks pristine...

Yes - I just did that an hour ago actually. Learning here. If I do a CSC takeoff, they will keep running and the controller behaves as if it's flying. However, the dead motor does nothing. Are there ways to electronically test the motor, perhaps with a multi-meter or look for signalling to...

Minor crash, no visible damage, props not broken. Now when I take off, one of these happes. Either a) One motor won't start and I see an error "motor obstruction", or b) One motor won't start but the drone will try take off and immediately tip over and crash again. If it does not crash, it...