Another copy of the Quanta N91A schematic at revision 1A, covering PCB DAN91AMB6D0, in a 1.43 MB PDF whose name shows it was duplicated more than once. The same size as the other N91A files suggests identical content. Quanta prints DA-prefixed board numbers on its PCBs, which makes matching straightforward: check the silkscreen before use. The diagram is useful for diagnosing no-power faults, following the always-on rails, tracing the EC and BIOS chip connections and finding components near a shorted rail with a multimeter.
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 @abgm_manutencao_esquemas. 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.