MacBook Pro A1278 archive for the J30 platform, logic board 820-3115-B with schematic number 051-9058, a 1.46 MB RAR. The B suffix is the board revision, and the 051 number identifies the schematic document set. Technicians use these diagrams to follow power rails, the SMC and charging circuitry, and to identify parts near a short. Confirm the 820 number and revision on the PCB first. Extract with WinRAR or 7-Zip and open the contents in a PDF reader or boardview viewer.
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 @hrtechno. Enginerys does not host this file.
All sources (2)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @hrtechno | 23 Feb 2020 | Open file on RM Schematics |
| @ShareMan_Electronic_Files | 28 Apr 2025 | 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.