Schematic PDF labelled DV15 MLK MB with the board number 11280-1, a numbering style used by Wistron, a major notebook ODM. The name gives no brand, so the target laptop must be identified from the board itself. The 1.97 MB drawing set covers power circuits, signals and connector pinouts for tracing rails and finding faulty components. Compare the 11280 number and revision silkscreened on your motherboard with the title block before using it.
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 @afssolutions. Enginerys does not host this file.
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How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.