Arduino Mega Fried (Not the regulator)

My 3d Printer was working just fine, I decided to add auto bed leveling using an inductive sensor. it was working fine. While auto leveling the bed, during the last leveling point the printer stopped working and the electronics gave some smoke. I found out that a component in the arduino got fried. can anyone help me with which component is that (in the picture), and possible causes so i can fix the problem before trying another arduino?
Thank you so much

... the burned part is the 3,3V-regulator ... maybe a short somewhere

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Viktor
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Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

I am thinking maybe there is an error in the voltage devider circuit i made to connect the 12v probe inductive sensor. so it gave a 12v to the arduino.
is this a possible senario? shouldn't be the 5v regulator that gets fried?

... if your Arduino has 3,3V signal level, then, if you set 12V to an IO-pin, you will fry the 3,3V circuitry ... and there could be much more damaged inside the other Chips too

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Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]

Thank you alot