Why is the flex ribbon cable burning up after installing?

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Feb 23, 2022
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I recently got a P3 pro which had an IMU error and limp gimbal (video works)
I fixed the IMU error and updated the firmware
The roll arm had been JB welded at some point, I bought the repair kit (not OEM), and installed it...on start up, smoke came from the SD card slot. (oh crap)
The ribbon was burnt (1st ribbon)
I figured I installed the ribbon cable incorrectly or something else, so I bought another cable (OEM), installed that and the same thing. Poof (2nd ribbon)
Im starting to think its a bad gimbal motor.
How do you test, to see if the gimbal motors are bad? the boards seem fine..im getting the correct Ohms on the POT...1/2 turn 2ohm/5ohms
is it hard to replace the pitch/yaw motors?
Id like to buy new motors, I just dont want to waste the time/money if they arent the cause of the problem
Thanks
 
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