Logic board schematic for the Apple iMac 27-inch, model A1312, with K23 being Apple's internal code for this main logic board (MLB). The PDF lets a repair technician trace power rails, standby circuits and signal paths across the board and locate the parts involved in a no-power or no-video fault. Apple drawings use the 820 or 051 numbers printed on the board, so check that the logic board in hand corresponds to this K23 design. It opens in any ordinary PDF 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 @schematicslaptop. Enginerys does not host this file.
All sources (15)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @schematicslaptop | 25 Dec 2017 | Open file on RM Schematics |
| @LaptopsBoardview | 4 Jun 2019 | Open file on RM Schematics |
| @freeschematicdiagram | 9 Jun 2019 | Open file on RM Schematics |
| @abgm_manutencao_esquemas | 12 Jul 2019 | Open file on RM Schematics |
| @hrtechno | 4 Feb 2020 | Open file on RM Schematics |
| @alischematics | 13 Sept 2021 | Open file on RM Schematics |
| @alischematics | 6 Jan 2023 | Open file on RM Schematics |
| @generalbios | 8 Oct 2023 | Open file on RM Schematics |
| @generalschematics | 19 Oct 2024 | Open file on RM Schematics |
| @generalbios | 15 Dec 2024 | Open file on RM Schematics |
| @generalbios | 15 Dec 2024 | Open file on RM Schematics |
| @boardviewsandachematics | 1 Sept 2025 | Open file on RM Schematics |
| @Satale_bios_esquemas_Laptop | 26 May 2026 | Open file on RM Schematics |
| @cyberlanelectonik | 14 Jul 2026 | Open file on RM Schematics |
| @schematics_bios | 13 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.