Schematic for the Quanta JX6 motherboard with revision D3B, in a 1.94 MB PDF. The unusual revision format suggests a specific production build, so check the revision printed on the PCB carefully before relying on values. No brand or chipset is given in the name. Quanta manufactures boards for several laptop brands, and its project codes link documents to hardware. Technicians use these pages to trace power rails, check the power-on sequence, find components on a shorted rail and follow signals to connectors and the BIOS flash.
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.