Schematic diagram set for Apple logic board 820-00840, revision A, provided as a 4.79 MB RAR. Apple prints the 820 number on every logic board, so compare it with the silkscreen on your unit before working from these pages. Technicians use the schematic to trace power rails, follow enable and power-good signals, find what feeds a shorted line and read component values. The extracted document is usually a PDF readable in any viewer, and pairs well with the matching boardview for locating parts and test points.
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 (6)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 14 Mar 2021 | Open file on RM Schematics |
| @pepeelectronica | 27 Apr 2022 | Open file on RM Schematics |
| @cyberlanelectonik | 23 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 26 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 3 Aug 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.