They will blow up genrally because if you are in a 240v area (230v in reality) and the charger is designed for 110v but still its change a bit to work with 240v so you get that bang and a puff os smoke which i think is the copper wire overheating inside the voltage regulator and breaking. genrally you can fix this by find where they two points broke but normally its on the inside of the wrap which is difficult so you have to replace it all.
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