Schematic PDF labelled ZHP ZSP with revision 1A, roughly 1.22 MB. The name does not state a brand, laptop model or board maker, so the project codes are the only clue and should be checked against the title block inside the document and the markings on the PCB. A schematic like this is used to trace power rails, follow signal lines, read component values and narrow down shorts or missing voltages. Confirm the code and revision on the board match before relying on the drawing for measurements.
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 @ithinkhs_casediscussion. 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.