Small 112 KB PDF schematic whose name points to an LS-D121P board; the LS- prefix with a P suffix is the style Compal uses for daughterboards such as I/O, USB or power-button boards, so this is likely a sub-board drawing rather than a full mainboard. No laptop model or brand is given in the name. Use it to trace connector pinouts and small power or signal paths between the daughterboard and mainboard, and verify the LS number 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 @pepeelectronica. 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.