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  • Answer to: Why iPhone 4 doesn't vibrate?

    Actually, I have been using the "tap the back" technique for about a month to get my iP4 to vibrate at all. The dang thing seizes up again after some unknown amount of time and I'm back missing calls and texts. If you understand how the vibration unit works, it's no surprise how the "tap the back" method helps. The unit consists of an unbalanced weight attached to a tiny motor. The motor spins the unbalanced weight and physics does the rest. Tapping the back, or the front for that matter, causes the weight to swing through some part of it's rotation. After it has been recently moved, it usually will work for a while. If you don't recognize the "tap the back" method as being the original technical support, you are just too young. Older folks like me call it "percussive maintenance." I'll never forget being instructed to employ the technique by a Silicon Graphics engineer to get a $12,000 hard drive working in a $70,000 computer. It seems that the bearing in the middle of the platters had leaked lubricating oil...