Quanta FL2 schematic at revision 1A. The name also ends with Sec, a suffix whose meaning is unclear and may refer to a section or secondary copy. The brand and model are not stated. Quanta is the ODM, and the FL2 code should appear on the motherboard silkscreen along with the revision. At 796 KB the PDF may be shorter than a full set, so check the page list. Use it to trace rails, check power sequencing signals and locate the parts involved in a fault.
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.