My screen wont turn on
there a 3 bubbles in my screen i saw then it turned black
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Devious the kid going by this "there a 3 bubbles in my screen i saw then it turned black" alone, it sounds like a bad display. Of course, we could verify if we would have images showing what's going on. Since we do not, replace the disapply and re-evaluate. Something like this guide Samsung Galaxy A12 Disassembly - iFixit Repair Guide can help you with your repair. Of course, you can also follow something like this video.
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