PDF schematic for a Positivo notebook identified as POS-AG31AP, 2.06 MB, the same size as another copy of this document. Positivo is a Brazilian brand that sources motherboards from ODMs, and the file name gives no revision or manufacturer code, so confirm the board marking matches before relying on it. Repair technicians use such diagrams to trace voltage rails from the adapter input, check the power-up sequence, find test points and isolate a shorted component. Any PDF reader opens it.
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.