When I turn on my vibration it doesn't work
my memory is 32GB. and my phone is 5s and I have a replaced screen but the vibration is not working
Try to reset your device. This won't delete your data stored on the phone.
- Press and hold the Sleep/Wake button
- Press and hold on the Home button
- Keep holding both buttons until the display turns off and back on with Apple logo on it.
Alternatively, you may go to Settings - General - Reset - Reset All Settings
https://support.apple.com/en-us/HT201559
If this does not help, restore your device to factory settings. Note that this will erase the data from your device.
Take a look this Apple Support article: Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support.
If these steps don't work, this may be a hardware issue. Take your phone to the nearest Genius Bar.
Hope this helps!