Schematic diagram in PDF for the Compal LA-A992P motherboard, 1.08 MB. The LA-xxxxP numbering is Compal's board code, and such boards are found inside laptops of several brands, but the file name does not say which notebook model uses it. Technicians open this kind of document in a PDF viewer to trace power rails, follow the power-on sequence, locate test points and identify the part responsible for a short. Confirm the LA number and revision printed on the PCB, as revisions can change components and net names.
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 @schematicslaptop. 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.