Schematic PDF named B465, 1.63 MB in size, without a stated brand, board number or revision. The designation may correspond to a laptop model, but the exact device must be confirmed from the title block on the pages. A circuit diagram of this kind is used to follow power rails from the charger input through to the CPU and memory supplies, identify test points and track down shorts. Open it in any PDF reader and verify that the board number printed on your PCB matches the drawing.
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 @hrtechno. 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.