Boardview for the Lenovo ThinkPad E470 mainboard, LCFC board number NM-A821, supplied as a 783 KB RAR archive. The name gives no revision, so compare the NM-A821 label and revision marking on the PCB against what the file shows. NM-prefixed numbers follow the LCFC scheme, the Lenovo-owned ODM. Once unpacked, the layout opens in common boardview programs and lets you search parts by reference, highlight nets, find test pads and trace a rail when hunting a short or a missing voltage.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @BoardSchematic. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.