lenovo IdeaPad 3-17ADA05,NM-C821 Rev:1.0 bios.bin 8MB bios.bin Lenovo IdeaPad 3-15ADA05 schematic.pdf NM-C821 schematic.pdf Lenovo IdeaPad 3-17ADA05 BoardView.tvw NM-C821 BoardView.tvw Lenovo IdeaPad 3-15ADA05 LCFC NM-C821 GS450 GS550&GS750.pdf Schematics LCFC NS-C821 IO r1.0.pdf NM-C821 photo HD