After motherboard-replacement no reaction from the upper screenHi, I bought two broken 3DS (eBay) to assemble a working on. The first on (in white) got damage by cleaning it with to...
Answer to "The 3DS don't charge any battery."In this case I would check the two fuses on continuity. Maybe one is blown so you need to bridge it.
Answer to "How do I fix my 3DS Error Problem?"Open it and look if everything is in the right place. If so try to unplug one thing you think it might be damaged and start the 3DS. I can imagine the Wifi-Device or the SD-Slot are damaged. Maybe the 3DS starts after that without an error-message.
Answer to "How would you go around swapping a 3DS' motherboard into another?"You have to do this guide Nintendo 3DS Motherboard Replacement You need to do the steps till the motherboard must be flipped and the ribbon-cable for the upper LCD must be removed. You have to do it for both 3DS. After that you can attach your new motherboard to the old upper part. You can also learn a lot in youtube-videos: http://www.youtube.com/watch?v=6GkdZrnIH...