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i have an iphone 6 the vibrator was working befor replacing the screen i still haven’t closed the screen into the chassis when i switch to the vibrate option it makes a very very low noise what going on? is the screen supposed to be intact in order for the vibrator to make noise?

It’ll still vibrate with screen closed. Try checking if you disassembled the vibrate motor and reassembling. Also make sure the volume cable is connected properly.