Amp2 burned instantly

Hi everyone !

I was very exited to try my new sound system, but when I plugged the power cord in the hifiberry it burned instantly.

I plugged only a 12v - 4.2a in the HifiBerry (no alimentation in the Rpi, only hdmi and ethernet, speaker unplugged has well). Then the chip instantly burned. 

See attached pictures.

What goes wrong ?! 

What can I do now ?

PS: The raspberry is still working fine now that I removed the HifiBerry.





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