I disassembled my 3ds to replace the stick and broke the ribbon cables for shoulder buttons. I assembled everything back after finishing and checked if it would boot up. It did so i put it on the shelf and waited about a month for new ribbon cables i ordered. When they came i assembled everything and now it does not turn on at all. I already replaced the battery and charged it separately from the console. Also I made a scratch on the motherboard but it booted up normally after that so i don't think that's the problem. (It's to the right of mini jack)