Circuit diagram for a Dell notebook mainboard made by Compal, board number LA-A972P, supplied as a 1.19 MB PDF. Neither the laptop model nor the PCB revision is given in the name, so check the board marking yourself before working from it. Compal schematics usually begin with a block diagram and a power sequence page, then cover each voltage regulator, the embedded controller and the connectors. That layout makes them handy for measuring rails, locating a shorted line and checking signals around the CPU and charging circuit.
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 @datasheets1. 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.