Full circuit diagram in PDF for Apple logic board 820-00939, revision A, Apple project J174. The 3.48 MB document covers the detailed schematic pages with net names, component values and the power sequencing logic. It is used for tracing rails, checking enable signals and identifying parts on a short. Apple marks logic boards with 820-xxxxx numbers and a revision letter, so confirm both on the PCB. For physical placement, combine it with the J174 location map or a boardview of the same revision.
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 @ShareMan_Electronic_Files. Enginerys does not host this file.
All sources (3)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @ShareMan_Electronic_Files | 10 May 2025 | Open file on RM Schematics |
| @ShareMan_Electronic_Files | 10 May 2025 | Open file on RM Schematics |
| @notebookschematic | 7 Mar 2026 | Open file on RM Schematics |
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.