RAR archive of 2.44 MB labelled as a schematic for the Xiaomi Redmi 4A smartphone, although the index files it under BIOS / firmware. The name gives no board revision or PCB code, so open the archive and confirm what it actually holds before relying on it. Phone schematics like this are used to trace PMIC outputs, battery and charging paths, display and camera connector pinouts, and to locate components when chasing a short or a no-power fault. Check that the board markings on the handset match the drawings before probing.
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 @SMART_PHONE_SCHEMATICS. Enginerys does not host this file.
All sources (6)
The same file was posted more than once. If one link is dead, try the next.
| Channel | Posted | |
|---|---|---|
| @SMART_PHONE_SCHEMATICS | 28 Sept 2021 | Open file on RM Schematics |
| @pepeelectronica | 21 Apr 2022 | Open file on RM Schematics |
| @pepeelectronica | 28 Apr 2022 | Open file on RM Schematics |
| @GENERAL_SMART_PHONE_SCHEMATICS | 11 Nov 2024 | Open file on RM Schematics |
| @cyberlanelectonik | 2 Aug 2026 | Open file on RM Schematics |
| @schematics_bios | 3 Aug 2026 | 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.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →