Schematic in PDF form for a Positivo board identified as POS-PIG43BC, revision R100. The name gives no laptop or desktop model beyond that code, so confirm the marking silkscreened on the PCB before working from it. A circuit diagram like this lets a technician follow power rails from the input stage through the regulators, check enable and power-good signals, and identify components around a suspected short. Any PDF viewer opens it; text search on net names speeds up tracing across sheets considerably.
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.