Schematic for the Apple 820-2494-A logic board, provided in PDF form in a 1.80 MB RAR. The name lists only the board number; Apple stamps these 820-series codes on the PCB, so they are the safest way to match a schematic to hardware. The diagrams show power sequencing, rail names and component values, useful alongside a boardview when diagnosing no-power or no-video faults. Read with any PDF viewer, and check that the revision letter on your board is A.
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 | 7 Feb 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.