3DS Top Screen not displaying + Top Piece Broken

Hello, I’ve got a problem with my old 3ds XL. When ever I turn on my 3DS the top screen does not display anything. also the bottom screen’s brightness is broken as well. my 3ds’s power and buttons works same and they are not broken. and some of the parts for the 3ds are missing I do have them somewhere but I’m gonna have to go look for them. i am really wanting to have my old 3ds fixed and working better some day.