ZIP archive of 1.23 MB for the Xiaomi Redmi Note 4, catalogued as firmware but named as a schematic, so the actual contents should be checked after extraction.

Xiaomi Redmi Note schematic in a 2.52 MB 7z archive; the name gives no generation number or device code name, so it most likely refers to the first Redmi Note, but…

Schematic diagram and service manual for the Xiaomi Redmi Note 3 Pro, Qualcomm version, in a 2.58 MB RAR archive.

Xiaomi Redmi Note 11 schematic combined with PCB layout pages, all in a single 3.03 MB PDF.

Schematic diagram for the Xiaomi Redmi Note 7 smartphone in a 1.65 MB RAR archive, although it is catalogued as firmware. The name gives no board revision.

Xiaomi Redmi Note documentation in a 2.56 MB RAR archive; although listed as firmware, the name describes a schematic diagram plus service manual.

Schematic and block diagram set for the Xiaomi Redmi Note 4, catalogued as firmware but described by its name as circuit documentation.

Schematic for the Xiaomi Redmi Note 9, a 3.63 MB PDF. A phone schematic lets a technician follow power rails from the battery connector and PMIC, trace charging, display…

Service documentation for the Xiaomi Redmi Note 4X: a schematic diagram and service manual in a 9.67 MB RAR archive, catalogued as firmware.