Apple schematic for logic board 820-1889, revision A, provided in PDF form in a 1.26 MB zip archive. Apple numbers its logic boards with an 820 prefix followed by a four-digit code, printed on the PCB itself. The name does not state which Mac model uses it, so verify the number on the board. Technicians use the diagrams to follow power rails, check the SMC and power sequence, trace signals and locate components when chasing a short or no-power fault.
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 (13)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 16 Oct 2021 | Open file on RM Schematics |
| @abgm_manutencao_bios | 23 Oct 2021 | Open file on RM Schematics |
| @abgm_manutencao_esquemas | 23 Oct 2021 | Open file on RM Schematics |
| @LaptopsBoardview | 13 Nov 2021 | Open file on RM Schematics |
| @pepeelectronica | 21 Apr 2022 | Open file on RM Schematics |
| @pepeelectronica | 24 Apr 2022 | Open file on RM Schematics |
| @generalschematics | 19 Oct 2024 | 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 | 24 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 24 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 1 Aug 2026 | Open file on RM Schematics |
| @schematics_bios | 14 Aug 2026 | Open file on RM Schematics |
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