My Phantom 3 Standard gimbal stopped rotating after replacing the flex cable. Before replacement it was twitching and wouldn't stay still. Now I'm getting "gimbal gyroscope error" in the status. I used an OEM Part #85 flex cable in official DJI smoke bag from Amazon. The camera works now but gimbal won't move at all.

Has anyone experienced this specific combination of symptoms? I've checked all connections twice and everything appears seated properly.

First thing - did you calibrate the IMU and compass after the repair? That error usually means the gimbal can't establish proper orientation reference. Try recalibrating through the Go app first.

Check if you removed all gimbal protectors and clamps before powering on. Also inspect the rubber dampers - if any are broken from the repair process, that can cause gyro errors even with a good flex cable.

I had similar issue on my P3S. The problem was the gimbal needed manual fine-tuning after flex cable replacement - the auto calibration couldn't compensate for slight mechanical changes. Go to Control > Gimbal Calibration > Manual and adjust each axis individually.