[Radiationman]

If the tech was being honest in saying he replaced the vibrator, then it's more likely the mainboard and a single output transistor or voltage output signal (series of smaller transistors that send voltage to a specific device)

Something like this can go bad but the rest of the components still work, in which case you are either out of luck and would have to purchase a new one, or find a tech who has a solider reflow machine and/or the skills and time to fix it. The transistor or component would be super cheap, the problem is the labor.

90% of phones theoretically can be easily fixed if you have the knowhow, its the expensive equipment to do so, and the time/effort people want to put in.