3DS turns on just when the charger is connected
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I bought this 3DS on ebay as faulty. It does turn on but just when the charger is connected, otherwise it does not turn on without it. I already tested the battery and one F1 fuse and EM1 inside. I am all confused what could cause this. Any help or suggestion would be appreciated. Please don't answer any non-technical thing, e.g. send it to nintendo and similar to that.