Compal LA-B843P laptop motherboard schematic supplied as a 3.95 MB PDF. The file name carries only the board number, so no laptop brand, model or revision is stated. Compal uses the LA-xxxxP pattern for its board numbers and builds boards for several laptop brands. A technician can use the diagram to follow power rails, check the power-on sequence and look up component values while hunting a short. Before relying on it, confirm that the number printed on the PCB reads LA-B843P, and check the revision as well.
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 @notebookschematic. 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.