Dji Phantom 3 Advanced GIMBAL MOTOR PROBLEMS

[M4RT1S]

Hello everybody, last year i had drone (DJI PHANTOM 3 ADVANCED) crash, my gimbal was broken and the flex cable damaged. Few days ago i tried to fix it (changed the flex cable, put the gimbal motors back together). After fixing and trying to start drone, gimbal won't function properly (example in the video). Can someone explain, why this is happening ?
Shows error "GIMBAL MOTOR OVERLOAD"...
P.S. Also one of the gimbal motors is heating very much.
https://m.facebook.com/groups/drones.to.fly/permalink/2403448683121901/