Schematic in PDF form for the Apple A1278 logic board 820-2530, code name K24. It documents power sequencing, the charging circuit, SMC signals and rail names, which is what a technician needs to diagnose no-power, no-charge or short faults. Opens in any PDF reader and pairs well with the matching boardview for component location. Apple uses 820-xxxx numbers for logic boards, and the number is silkscreened on the PCB, so verify it before following values or part numbers.
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 @cynetitsolution. 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 | |
|---|---|---|
| @cynetitsolution | 17 Jan 2026 | Open file on RM Schematics |
| @schematics_bios | 5 Aug 2026 | Open file on RM Schematics |
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.