I am trying to diagnose a problem without having to disassemble and desolder.
My quad keeps yawing and sometimes drops uncontrollably since I put it together. I recently noticed that one of the Sunnysky 2216 900kv motors sometimes does not spin up with the others until I give more throttle to make it go. Sometimes I even have throttle down and back up again.
Once I get up in the air, I sometimes hear one motor speeding up a lot to maintain hover. The 4 ESCs have been identically programmed, except 2 that are reversed, which the problematic one is not one of. I used default settings and am using a OP Revolution FC.
What tests, if any, can I do to isolate the faulty component before I start changing them? Is it more likely to be the motor or the controller?
Thank you.