Apple logic board schematic for 820-00034-A, project J117 MLB (main logic board), provided as a PDF in a 1.90 MB RAR archive. Apple's 820 numbers identify the board and are silkscreened on the PCB. Technicians use these pages to follow power rails such as standby and main supplies, check SMC and power sequencing signals and diagnose no-power faults. It pairs well with the matching 820-00034 boardview. Confirm the board number and revision A on your PCB before relying on it.
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 | 12 Nov 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.