If by internal crack you mean like a broken screen, but you can't feel anything broken when touching it and the colors AREN'T distorted or wrong, then it's just that the underside of the screen glass broke. That's all, nothing expensive or too much, just a simple protective glass replacement! Anyone will do it and just a heads up, it shouldn't cost you more than 20-30$! Like Mikaya said, ask customer support first. Also, another thing most people don't understand is that even with an expired warranty, Nintendo, which made the console (or any other company for that matter), will still fix it, just not for free. Don't go to some suspicious shop where they could just outright ruin your console!