I accidentally switched-on my computer from US that is set to 115 Volts. Power at home is 220 Volts. What could be the components that were damaged inside the power supply?
If this is a desktop power supply as laptop supplies should be auto-detecting/switching, it would probably be cheaper and less hassle to just replace the supply being that you can pick one up for $20-$60 average depending on brand/wattage. Switching power supplies can be a pain to work on and then trying to find those hard-to-find transistors is no fun
The most likely failure point would be the main rectifier diodes, to fail short which should have popped an internal fuse. If the supply was not fused, then the diodes would eventually smoke and fail open saving what might be left of the supply. Also, with no fuse, the shorted diodes would have put AC directly on the main reservoir capacitor and they would be smoked as well. I am assuming it did not remain plugged in this way for more than a few seconds. Continued operation whould have overloaded the regulator circuit eventually smoking it as well. The computers battery would act as a buffer to this catastrophy, so it should have saved the computer chassis itself from damage. Getting a replacement supply will be much smarter than trying to diagnose and repair one that has smoked. Most modern supplies do not have a voltage switch, they are universal in 100-240 volts 50/60 cycle without adjustment.
