Schematic for the Apple logic board numbered 820-01949, packed as a RAR archive of about 2.98 MB that should contain the PDF circuit diagram. The name gives no model or revision, so match the 820-number silkscreened on the board before trusting it. Apple uses this 820-xxxxx numbering for its logic boards. Technicians use such a schematic to follow power rails, check the sequencing of enable and power-good signals, and look up component values when hunting a short or a missing voltage. Any PDF reader opens it once extracted.
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 | 18 Aug 2022 | 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.