Thing is i see so many onshore/offshore electronic tech jobs requesting ‘be able to fault find to component level’ advertised.
Production faults i felt were the hardest to find i,e PCB is fully populated and will not work. You could have a mix of open and short circuits and/or wrong value components or in the wrong place.
Returned faulty from the field were more easy as it had worked in the first place. Most of the time it was a fault on the power supply side like faulty diode, etc.