Apple logic board schematic for board 820-3330, revision B, with the project code J31 in the name. Apple numbers its logic boards in the 820-xxxx format, and the trailing letter marks the board revision. Technicians use these PDF sheets to follow the power path, read rail names, find the parts behind a shorted line and check power sequencing on a board that will not boot. Open it in any PDF viewer and search by net name. Check the 820 number and revision printed on the PCB before relying on component values.
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 @abgm_manutencao_esquemas. 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 | |
|---|---|---|
| @abgm_manutencao_esquemas | 11 Jan 2020 | Open file on RM Schematics |
| @hrtechno | 23 Jul 2021 | Open file on RM Schematics |
| @alischematics | 13 Sept 2021 | Open file on RM Schematics |
| @pepeelectronica | 28 Apr 2022 | Open file on RM Schematics |
| @ShareMan_Electronic_Files | 28 Apr 2025 | Open file on RM Schematics |
| @schematics_bios | 3 Aug 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.