Dear sir
After my Dji fpv crashed, the gimbal got damaged so i replaced it with new gimbal but when i power on the drone the gimbal vibrates and there is some kind of scratchy sound from gimbal and gimbal does not responds to control dial from controller but there is video feed

Hello there. I am sorry for the trouble this has caused and thank you for reaching out.  Since there was a crash that happened before on your DJI FPV and now you are having this issue on the said DJI drone. It would be best to contact our DJI support team at https://www.dji.com/support for further assistance. We will do our best to check the said DJI drone and give out the best resolution for this issue. Again I am sorry for this trouble and thank you.