PDF schematic for the Quanta AM9A board, roughly 1.51 MB. The name gives the Quanta project code only, with no revision, laptop brand or model, so the title block and silkscreen should be checked to confirm a match. Quanta boards normally carry the project code inside a DA0 part number. Technicians use these sheets to trace the power path from adapter input to CPU rails, find test points, check component values and isolate a shorted line. Revision differences can change values, so confirm before measuring.
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 @ithinkhs_casediscussion. 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.