Default [Q] Nexus 7 bricked/fried. Any ideas why?

Hello guys.
I have a Nexus 7, with a huge problem.
Ever since my little sister took it to Europe (and plugged it into a 220 volt instead of the 110 that we use here in the U.S), it died. Now, I've opened it and checked if the battery was somehow poorly plugged or something, but nothing.

The device will not turn on unless connected to a power source (and even then, not 100% of the time) (both my Macbook and wall work). This is what it looks like:



Is this a battery problem? Or a screen problem?
Also, when I took these pictures, it was the first time I could see the "Google" logo on the screen (although barely)

Any help would be greatly appreciated!
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