Schematic for the Apple MacBook A1278 logic board 820-2936, revision B, carrying the K90i project code, packed as a PDF in a 1.69 MB RAR archive. Apple numbers its logic boards with the 820 prefix, and the suffix letter marks the revision, so check the board marking before use. Technicians rely on this document to trace power rails such as PP3V42_G3H, find SMC and charging circuit signals, and identify parts when a board will not power on. Any PDF viewer opens it, ideally alongside a matching boardview.
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 (4)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 24 Dec 2022 | 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 | 14 Aug 2026 | Open file on RM Schematics |
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.