RAR archive of 2.09 MB for the Apple MacBook A1278 with logic board 820-2565-A, where 820 is the Apple prefix for logic board numbers and A marks the revision. The name does not list contents, but such packages usually carry a schematic, a boardview, or both. They are used to trace PP3V42 standby, PPBUS and other rails, find test points and check the SMC power-up chain. Confirm that the 820 number etched on the logic board matches exactly, as A1278 units used several different boards over the years.
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 @boardviewsandachematics. Enginerys does not host this file.
All sources (3)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @boardviewsandachematics | 1 Sept 2025 | Open file on RM Schematics |
| @cyberlanelectonik | 4 Jul 2026 | Open file on RM Schematics |
| @cyberlanelectonik | 14 Jul 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.