Quanta BY7D motherboard schematic at revision 1A, distributed as a 755 KB PDF. The name holds only the Quanta project code and board revision, with no retail model listed, so the BY7D marking on the PCB is the key to matching it. With the diagrams you can follow the power-on sequence, measure expected voltages on each regulator, trace the keyboard and EC lines and isolate shorts to a specific rail. Open it in any PDF viewer, and check that the revision matches before swapping parts based on its values.
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.