Giant Energypak smart charger repair process. It went wrong due to overvoltage.

This GLI270AA bike charger suffered a serious overvoltage. Due to the interruption of the neutral conductor, nearly 400V was applied to it.
Please be careful, 230 V is a rather dangerous voltage.
I have a fault current protective switch and sometimes I also use an isolating transformer.
Moreover, the buffer capacitors remain under voltage for a long time, even when the power supply is switched off.
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[@DanielMichael-e1p]

I have a problem with the same charger for my ebike. The charger turns on after connecting to the power supply, then the diode lights up red, then green and again red, then turns off. Inside you can hear how the processor works. Is there a possibility of repairing it? Please help and contact me in my case. Best regards

[@BikeArea]

[@manuelpascual7333]

How can I get my charger repaired

[@DanielMichael-e1p]

I have a problem with the same charger for my ebike. The charger turns on after connecting to the power supply, then the diode lights up red, then green and again red, then turns off. Inside you can hear how the processor works. Is there a possibility of repairing it? Please help and contact me in my case. Best regards

[@mcelec7603]

In the case of industrial electronics, it is worth repairing power supplies and PCBs costing thousands of euros, and spending time reverse engineering the operation. I repaired this power supply as a hobby, its owner has already bought another one, because she was told in the service center that it cannot be repaired. It's not a cheap power supply though, it costs at least 400 euros. I couldn't find any documentation for it at all, so it is much slower to diagnose the device. So the question is not so much whether it can be fixed, but how long it takes and whether it is worth spending a lot of time with it.