How are your troubleshooting skills? I'd say my EEs spend 50% in design and 50% in debugging customer problems when a board fails in manufacturing or fails in

How are your troubleshooting skills? I'd say my EEs spend 50% in design and 50% in debugging customer problems when a board fails in manufacturing or fails in the field. The answers can be easy (say, a resistor is out of tolerance or the wrong oscillator was placed on the board), or they can be really tough (a transient is killing a FET and locking things up).