Archive for the Lenovo Y510, 1.23 MB in RAR format; the name gives only the model and no board number, ODM or revision. At this size it most likely contains a schematic PDF, used to trace power rails, follow the startup sequence and locate components during repair. Because several board designs can exist for one model family, read the code printed on your motherboard and confirm it matches the document after extracting it, before relying on any value.
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.
7-ZipWinRARThe Unarchiver (macOS)