Thank yoy very much for your response, ill try it right now, yeahh i left flux im gonna clean around that area, so if i clean correctly, my issue can be solved ?those 3 points aren't the issue, firstly try to clean off what looks like flux you used, it's possible you used plumbing flu which is very corrosive, I have seen stuff in the past where people have used plumbing flux and the left over residue corroded traces a few months down the line, so that would explain it working for a while afterwards then suddenly failing
see if the residue comes off with a greeny tint, this would indicate it was an acidic flux and it's probably corroded some traces or something
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i mean i didn't anything more than the soldier points and my 3ds was working for a year, and suddenly it's giving me this problem from nowereYou didnt do anything strange but you disassembled it, soldered it and left some kind of 3 points inside ?
Id say thats damn strange