Schematic PDF for the Apple MacBook Pro 15-inch A1707, logic board 820-00281. Apple numbers its boards in the 820-xxxxx format, and this number should be checked against the marking on the PCB because one model can ship with several board variants. The diagram set is used for following power sequencing, identifying rail names and tracing signals between the PMIC, charger and SoC areas. Any PDF reader opens it, and pairing it with a matching boardview speeds up locating parts.
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 @schematicslaptop. Enginerys does not host this file.
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The standard format for schematics, block diagrams, power-sequence charts and service manuals.