2DS backlight not working, LCD working perfectly fine

If you put a flash you can barely see the contents of the screen, but the system does work! I’ve tried cleaning the board and reseating the cable, someone told me this might be a shorted backlight fuse, but I’m not sure which one to check. Does anybody know what fuse is the backlight fuse or if there is another solution? I’d like not to have to buy another motherboard.