No one.

But no one could fix a capacitor or resistor for less than it would cost to manufacture a new one. "fix a capacitor" even seems silly to say, because it is beyond the scope of the average person to fix. A similar analogy is a car engine, you can repair the engine, however mostly what a mechanic does is swap out pieces. Some things can be fixed with a welder, most (spark plugs, gaskets, belts, even parts like a carburetor) are just replaced. This is similar for "technology" items. The parts may not be fixable but sub-components should be replaceable; the overall product should be repairable.