Schematic diagram in PDF for Apple logic board 820-2491, with the project code K51 given in the name. No retail Mac model or revision is stated, so confirm the 820- number printed on the board before use. Apple identifies logic boards with 820- numbers, and the project code also appears in the drawing title blocks. Technicians use these sheets to follow power rails and sequencing, check the SMC and charging circuits, trace signal paths and identify parts on a short. Any PDF viewer opens 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 @alischematics. 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 | |
|---|---|---|
| @alischematics | 13 Sept 2021 | Open file on RM Schematics |
| @pepeelectronica | 28 Apr 2022 | Open file on RM Schematics |
| @ShareMan_Electronic_Files | 29 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.