My APM died when I tried to plug the MTKGPS to it

Yesterday again trouble happened with mine quad.

I soldered a magnetometer on the OilPAN 
Then I uploaded the test code for compass to get offsets and everything was working well and I decided to load SuperStable code.

I switched off everything, in order to plug the MTK-GPS. Then plug back the usb wire and led’s stared to blink as usual. I decided to get latitude from GPS, to check it last time, before uploading the fying code and I moved a quad close to the window to see satellites.
I saw that gps plug are a bit skewed in the socket, and I have corrected it and the board suddenly died.... Led's are not blinking anymore.....
I tried to start it without any external parts but not managed.

The apm is not working at all, neither from external power, nor from FTDI cable.
RIP

But the OilPAN seems to work, at least led’s are working when I plug it to usb without APM.

I checked  the fuse on APM and it work, but I have no idea what to check else.....
Probably someone could guess, what to check or replace in order to resuscitate it?
 Victor.

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