Apple 820-2179 repair material packed in a 1.30-ish range archive, 1.38 MB in RAR format. The name gives only the board number, without revision or document type, so check the extracted files to confirm whether a schematic, boardview or both are included. Match the 820 number and revision on the PCB before trusting part values. A schematic for this board helps follow the power path from the charger to each rail, read enable signals and narrow down which component is shorting a line to ground.
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 @Mac_Shematic_Santale. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.