Boardview for Apple logic board 820-01521, tagged PJJ MLB and Pre-EVT2, in BRD format at 581 KB. Pre-EVT2 points to an early engineering stage layout, so component positions or values may differ from retail boards and should be checked against the actual PCB. MLB stands for main logic board. Use OpenBoardView or FlexBV to locate parts, trace nets and find test points while diagnosing power or signal faults, and confirm the 820-01521 number printed on the board first.
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 @IT_SERVICE_WORLD. Enginerys does not host this file.
All sources (10)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @IT_SERVICE_WORLD | 2 Oct 2019 | Open file on RM Schematics |
| @abgm_manutencao_esquemas | 25 May 2020 | Open file on RM Schematics |
| @alischematics | 16 Sept 2021 | Open file on RM Schematics |
| @pepeelectronica | 28 Apr 2022 | Open file on RM Schematics |
| @laptexdna | 25 Jul 2022 | Open file on RM Schematics |
| @boardview | 14 Sept 2024 | Open file on RM Schematics |
| @generalschematics | 15 Sept 2024 | Open file on RM Schematics |
| @dtechbios | 16 Dec 2024 | Open file on RM Schematics |
| @laptexdna | 11 Mar 2025 | Open file on RM Schematics |
| @schematics_bios | 3 Aug 2026 | Open file on RM Schematics |
How to open a .brd file
The most common boardview extension. Several unrelated formats share it, which is why one viewer opens a .brd and another refuses it.