Answer to: How can I fix it if it broken in halfIf it is just the hinge that is broken (I'm assuming that's what you mean by 'broken in half'), then you will need to replace the center housing. It's a difficult process for a beginner, and can cause problems with the system if done incorrectly. A video of the process: https://www.youtube.com/watch?v=dVn_m_OI... Most steps in the process are here: Nintendo 3DS XL Touchscreen Replacement In order to reattach the top screen, remove the shell of the top screen as shown in this guide: Nintendo 3DS XL Upper LCD Display Replacement From there, follow the video I posted before. Take care to not strip any screws or break any grey flaps connecting ribbon wires to the motherboard. I only say this because those were the two main issues I have had while repairing my system. I haven't been able to resolve the latter, and now my C-Pad is unresponsive, so learn from my mistakes. If this feels above your current skill level, then I suggest finding an electronics repair center to fix it for you. Good luck.
Answer to: How do I replace the Black Midframe on the 3ds XL?This is a pretty difficult replacement, since it involves opening up both halves of the system. This is a video on how to fix a cracked hinge by replacing the midframe: https://www.youtube.com/watch?v=dVn_m_OI... I'd give it a quick watch before deciding whether or not to replace it. Assuming that you are a beginner to this sort of thing, the risks to damaging your system are pretty high. (I did this to fix a cracked hinge, and regret not being more careful, as my circle pad no longer works. But now I have an excuse to buy a New 3ds, so I suppose it's not all bad.) Most steps to the process are in this guide: Nintendo 3DS XL Touchscreen Replacement However, in order to re-attach the top screen, you will have to remove its outer shell, as shown in this guide: Nintendo 3DS XL Upper LCD Display Replacement From there, just follow the first video, taking care to not damage the wires. These can be slid through a slit in the casing by the hinge. The main things to watch out for are - Don't strip any screws. If the ...
Answer to: Best way to repair broken shellIn order to fix the hinge by replacing the center casing, a near-complete disassembly of the system is required. https://www.youtube.com/watch?v=dVn_m_OI... This video shows the complete process. If you are a beginner to the repair process, I would suggest finding a local electronics repair center to do it for you. But if you are confident, then most steps for this process can be found in the touchscreen repair guide here: Nintendo 3DS XL Touchscreen Replacement Make sure to get a good screwdriver and to be careful with the wire attachments.