Apple schematic for logic board 820-00939-A, project code J174, packed as a RAR archive holding the PDF drawing set. The 820- prefix is Apple's own logic board numbering, and the suffix letter marks the revision, so compare the number silkscreened on the PCB before trusting rail names or part references. Technicians use such a set to follow power sequencing, find where a short sits on a rail, and identify connector pinouts. Extract the archive and open the PDF in any reader that supports text search for net names.
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.
All sources (4)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 11 Jan 2023 | Open file on RM Schematics |
| @boardviewsandachematics | 2 Sept 2025 | Open file on RM Schematics |
| @cyberlanelectonik | 4 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 14 Aug 2026 | Open file on RM Schematics |
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.