You're making this all too much fun!! :} It's nice to see we are both able to learn something at our age.
It is my feeble understanding, (since we can't get any answers from DJI, "proprietary" and all), the magnetic ring in the body of all gimbal motors is what acts on the "rotor", or motor, where the windings are located. Impulses from the circuitry act on the motor in a feed back loop to the circuit board, where the signal is processed and received from the accelerometer to match the stabilizing feature the accelerometer produces. If we replace all the offending components, including the ribbon cable, and get the same results, the problem is either with the accelerometer or the camera's main circuit board. That's encouraging isn't it? We often think that the camera received damage from the crash, how about the condition of the drone's internal electronics? I have had several customers who think I sold them a bad camera. After extensive "coaching", they realize there is something wrong with their drone. Of course, they never bother to drop me a note to let me know that was the case.
The only way to determine which component is the offender(s), one would need a perfect working drone and a perfect working camera. This is what I have for my P2v+ Version 2 AND 3 and the P3 models. I have all 3. I just received a new P4 and will have to remove the camera and use it to test the gimbal. That means removing the camera and swapping gimbals. This way I can use the process of elimination to determine the source of the problem. I may even have to swap out component by component to narrow down which one is causing the problem. And then, sometimes it is more than one component. Ain't this fun? Many times I have had to go through this process to finally come up with a good working camera. Sometimes I get really lucky and notice that someone has installed a counterfeit ribbon cable and that is all that was wrong with a perfectly good camera.
So far, my limited experience with the P4 camera is in need of more experience, hence, I will be.............tearing down my new P4, but, that's why I bought it.:{ I'm a fixer more than a flyer.
Watch this spot.
Jim