Quanta QL4 laptop motherboard schematic, a 1.52 MB PDF with no revision, brand or model stated in the name. Quanta project codes like QL4 correspond to PCB numbers of the form DA0QL4MB plus a suffix, usually silkscreened near an edge of the board. Technicians use these pages to trace the power-on sequence, measure expected voltages at regulator outputs and read connector pinouts. Open the title block to identify the revision, and verify it against the markings on the PCB before replacing any components.
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.