My device not vibration

@chupchap could be a bad setting. Go to Settings > Sounds and vibration. Enable the toggle for Vibrate while ringing. If it's on, disable it and then enable it again. Next you want to start your phone is safe mode and check the vibrate motor. If it works in safe mode, it is possible that you have an app on your phone that interferes with its normal operation. You would have to disable each one separate to determine which one this is.

If none of this works then it is possible you have a bad motor. Follow the flowchart to check it out.

Use the search function of your PDF reader to find the components required to test, in this document A70 Component