Originally Posted by LudicrousPeed
That recording was with the microphone right up against the phone.I made a new recording (I've replaced the original with it) that is maybe a better representation, from a couple inches away instead. It's just so loud. I guess you get what you pay for, and that's one of the cheap components. Although I've read elsewhere of someone saying their Moto X all of a sudden started sounding like this rather than a smooth, quiet vibration. Almost as if this is a result of a poorly attached vibration motor or one that has become slightly detached.
I took a phone apart (and then returned it's sorry self to Tesco lol)...
The vibration motor is not loose to the board - it is soldered firmly.
The weight is fixed to the shaft of the motor correctly. I attached bits of blutack to the weight - no difference.
The shaft of the motor to which the weight is attached can move up / down a little.
The motor is located right next to the camera, which has moving parts in it (you can hear this on exiting a camera app - an audible click). I wonder if the motor is making something in the camera rattle.
The rattle still happens with the back of the phone and PCB cover removed - so it is something contained in the front part of the phone. To me it sounds more like the vibrate is making the earpiece speaker click.