Why doesn't vibrate work after repair?

hi i have the exact same problem. the top is chipped hence no vibration. isit the copper coil that makes a difference or is that the antenna ?

the copper coil that sits under the board and attached to the vibrate motor is mostly likely either damaged or placed at a weird angle where it wont make contact with the board.

I don't think it's to do with that small copper piece as mine isn't broken but i have exactly the same problem with the vibrator.

Also after the repair i first got problems with the home button and vibrator and now getting issues with signal.

Same problem here,

I'm beginning to think its because a small clip which is normally attached to the chasis is missing.

The same one that helps clip the cover plate (the one at the top which hides the LCD/JACK ect connectors) back down.

Without it your cover sits over the ribbon cable for the volume/silent switch ect, and might be causing damage?

hmmm....?

I'm having the same issue after replacing a broken digitizer. I tested the motor with a AA battery and confirmed that the motor works. I also tested the contacts on the motherboard using a multimeter and ibrate and got no response. I'm not sure if this a software issue or a hardware one. I'm fairly certain I didn't damage anything during the repair. Any suggestions?

Same exact problem after replacing proximity sensor cable. I also broke the copper coil...

It could help with a recovery to factory(wipe phone complete)

Seems like there are more questions than answers here haha.

Don't tighten down both screws for the vibrator motor. Leave them loose, and reposition the motor to allow it space to turn.