2 best For Parts New 3ds XLs

Product Name: 2 best For Parts New 3ds XLs
2 consoles partially disassembled, broken, or needing repair Pokemon 3ds - I bought it working perfect except one of the layers of the top screen had oily circles floating in it. Bought a replacement screen and swapped it out but then I got the blue light and pop thing where it won't turn on as if a cable is not connected. I tried to replace the motherboard but i believe the motherboard I bought had a defective top screen ribbon connect because the ds booted up but the top screen showed nothing. I tried to mix match screens and mobos once or twice after that. I've since lost the other top screen I don't know if the current one is the replacement or the original with the oily circles. Grey 3ds - this one I bought and it never showed signs of life. I don't think it ever charged or turned on but it does not seem to have any water damage, probably a power fuse or something like that is bad. I think I tried the mobo in the Pokemon 3ds but that's it 2 complete 3ds and 1 best extra mobo.