PDF schematic of the Compal LA-2201P mainboard; the file name gives no brand or laptop model, only the board number. Compal uses the LA-xxxxP pattern for its notebook designs and silkscreens it on the PCB along with a revision. The diagram lets a technician trace power rails, follow the power-on sequence, check the charging circuit and locate components near a fault. Since this is an older design, confirm the board revision on the PCB matches and research which models used it before trusting part values.
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.