Lenovo Y470 repair documentation in a 1.08 MB RAR archive, with no board number or revision stated in the name. Files of this size usually hold a schematic, which helps follow voltage rails, charger circuitry and the power-on sequence, and locate parts when hunting shorts. Open it with an archive tool, then compare the motherboard code shown in the drawing with the one silkscreened on your PCB before using component values, as different board designs may exist for the model.
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 @IT_SERVICE_WORLD. 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.