Schematic PDF named TERESA20, 1.72 MB, which appears to be an internal project or platform name for a laptop board; the file name itself does not state a brand, model or revision, and the number may indicate a version but that is not certain. Open it in any PDF viewer and check the title block on the pages for the actual board number. Such diagrams help trace the power-on sequence, locate test points and find the parts surrounding a short. Always match the document to the code silkscreened on the motherboard before use.
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.