Lenovo schematic labelled only with the code 80A, which gives little to identify the exact model, board number or revision. Open the PDF and read the title block, then match the project code against the markings on your motherboard before trusting any values. A document like this is used for tracing power rails and signals, locating the charger, EC and VRM circuitry, and finding components on a shorted line. The file is about 1.16 MB and opens in any common PDF reader.
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 @schematicslaptop. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.