You can get shocked from touching just a PCB board, here is the explanation details:

1)As a matter of fact, the PCB board on the equipment do have some varying degrees of shock while working. However, PCB board has been fixed already so that the shock doesn't have too much impact to the normal working of the circuit board.

2)Besides, vibration test is not only to evaluate the reliability of SMT welding on circuit board (such as eliminating cold solder joint.) but also to verify the reliability of the electronic part of the finished product (Such as the components welding of the finished product, including both SMT and THT, the shock of finished product during transportation link and so on.)