Can the box be repaired?

I charge from a generator occasionally. There has been a trend of things pugged into the generator dying. I think by turning off the generator while the charger was plugged in, it may have dropped voltage under the acceptable range. What would this do to the box to make it not work, and how can it be fixed?

I’m on my way to best buy, where I’ll pick up a new one because I can’t work without the charger, but I’ll return that if I can get this one running again.

Any help would be wonderful.

Be healthy!