Apple schematic in PDF form for logic board 820-00939, project J174, delivered inside a 2.91 MB RAR. Apple marks its logic boards with 820-xxxxx part numbers printed on the PCB, and that number must match before the diagram is trusted. Technicians use these schematics to follow the PP rail names, check power sequencing from the SMC and charger, and identify the component causing a short. Any PDF reader opens it after extraction, and searching net names speeds tracing.
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.