A31p - unable to charge the battery

[ben]

Hy all!

I've a Thinkpad A31p which is now three years old.
Today i was working on the notebook and suddenly i heared a gently bang and the thinkpad shutted down. Due to this the fuse of our house was disabled(!).

Now I can power on my thinkpad only with the battery. No chance with the power supply. With the power supply I can no more charge the battery.
I tried also another charger, without success

Any ideas? Does I have to change the mainboard of my TP? Or is there any fuse which could be the problem?

Any help is welcomed!
ben