Apple MacBook A1278 logic board schematic for board 820-2936, revision B, with the project code K90i noted in the name. Apple uses the 820- prefix for board part numbers, and the revision letter matters because circuits change between revisions, so check the silkscreen first. The PDF helps a technician follow the power-up chain from the SMC and charger to the CPU and memory rails, find test points and diagnose shorts or missing voltages. It opens in any standard PDF viewer with searchable net names.
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 @laptexdna. Enginerys does not host this file.
All sources (5)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @laptexdna | 17 Jul 2020 | Open file on RM Schematics |
| @one5technology | 25 Nov 2020 | Open file on RM Schematics |
| @laptexdna | 25 Jul 2022 | Open file on RM Schematics |
| @generalschematics | 15 Sept 2024 | Open file on RM Schematics |
| @generalschematics | 16 Sept 2024 | Open file on RM Schematics |
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.