Schematic in PDF form for the Apple A1278 MacBook Pro logic board 820-2879, revision B, compressed as a RAR archive of about 1.65 MB. The diagrams show power sequencing, rail names, PMIC and charger circuits, letting a technician follow a missing voltage back to its source or work out why a board stays in a no-power state. Pair it with the matching boardview to find physical part locations quickly. Apple 820 numbers differ between revisions, so verify the PCB marking matches before relying on values.
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 (3)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 7 Apr 2024 | Open file on RM Schematics |
| @cyberlanelectonik | 14 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.