Schematic in PDF for the Apple iMac A1418 logic board 820-00431, revision A, packed as a 2.46 MB RAR archive. Apple's 820- part numbers identify the logic board itself rather than the computer model, so check the number etched on the PCB. Technicians rely on these diagrams to trace power rails, follow the power-up sequence, and find component values when diagnosing no-power, no-video or short faults. Open it with any PDF viewer and pair it with a matching boardview for component locations.
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 | 9 Jun 2022 | Open file on RM Schematics |
| @boardviewsandachematics | 1 Sept 2025 | Open file on RM Schematics |
| @cyberlanelectonik | 16 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.