my iphone was vibrating with black screen
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2014 5 27 If the display turns on, go to step 4. If the display remains black, go to next step. Connect the iPhone to a computer and open iTunes. If iTunes recognizes the iPhone and indicates that it is in recovery mode, attempt to restore the iPhone. If the iPhone doesn't appear in iTunes or if you have difficulties in restoring the iPhone, see this
How does the vibrating screen work?
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2021 6 7 The vibrating screen works by using the double rotation vibration generated by the vibrator. The upper rotating weight of the vibrator makes the screen surface vibrate in plane, while the lower rotating weight makes the