Huawei Honor 6 reference sheet in PDF form, covering the input and output voltages of the phone's circuits, filed under schematics at 1.24 MB.

Huawei Y9 2019 smartphone schematic in PDF format, 4.32 MB, titled in Spanish as esquemático.

Schematic diagram in PDF for the Huawei Honor 4X smartphone, 1.16 MB. The name gives no board number or revision.

Schematic diagram for the Huawei G520-0000, a compact 598 KB PDF whose Chinese title means schematic or circuit diagram.

Schematic diagram in PDF form for the Huawei P30 smartphone, a fairly large 35.9 MB document that likely spans the full logic board circuitry.