Schematic PDF identified only by the codes H0225-3, 48.4KH17.031 and LDB1; the name does not state a laptop brand or model. A part number in the 48.4xxxx.0xx form is typical of Wistron PCB designations, and LDB often marks a daughter board rather than the mainboard, though the PDF itself will confirm this. The 1.66 MB file is used to trace connectors, power lines and signals between boards. Compare the codes printed on your PCB before relying on 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 @cynetitsolution. 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.
Any PDF readerSumatraPDFFirefox / ChromeFlexBV (links PDF to boardview)