Dell schematic in PDF form, 369 KB, labelled PA-12. Dell uses the PA-12 designation for a family of 65 W laptop AC adapters, so the document most likely covers the power brick circuit rather than a motherboard, though the name gives no further detail. A technician can use it to follow the primary and secondary stages, feedback loop and ID pin circuitry when repairing a dead or cycling adapter. Compare component markings on the actual PCB before relying on values, since adapter revisions differ.
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 @nityatechnology2020. 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.