Schematic PDF for an Apple MacBook logic board numbered 820-00239, 6.09 MB. Apple uses the 820-xxxxx scheme for its logic boards, and the number is printed on the PCB, so check it before following any page. The PDF covers power sequencing, rail names and signal paths and opens in any PDF reader. Technicians use it alongside the matching boardview to trace a missing rail, understand the charging and SMC circuits, identify component values and work out why a board stays dead.
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 @pkbiosbdv. 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.