Small 140 KB RAR archive for Apple main logic board 820-01521, labelled PJJ MLB Pre-EVT2. Pre-EVT2 marks an early engineering validation build, so some details may differ from the production board. PJJ appears to be an internal project label, and MLB stands for main logic board. At this size the content is probably a boardview, which opens in OpenBoardView or FlexBV to locate parts and nets. Check for layout differences against a retail board before relying on component positions.
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 @pepeelectronica. 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 | |
|---|---|---|
| @pepeelectronica | 20 Apr 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 | 23 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.