Schematic of the main logic board for the iPhone 8 Plus, identified in the name by its D21 code, in a 1.91 MB PDF. MLB stands for main logic board. The drawings let technicians trace power rails, check the baseband and audio circuits, and locate components behind shorts or missing voltages. It opens in any PDF reader where search helps find net names. Confirm the board variant, as Intel and Qualcomm modem versions differ, before relying on specific pages.
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 @mobileschematicshub. Enginerys does not host this file.
All sources (5)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @mobileschematicshub | 8 Nov 2019 | Open file on RM Schematics |
| @schematic_mobile5 | 28 Mar 2021 | Open file on RM Schematics |
| @canalesquematicos | 21 Feb 2026 | Open file on RM Schematics |
| @canalesquematicos | 24 Feb 2026 | Open file on RM Schematics |
| @canalesquematicos | 21 May 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.