This is a professional paid tool, but they frequently release updates for Vivo models that include detailed bitmapping and circuit tracing.
A full schematic diagram for the Vivo U10 typically covers the following sections: vivo u10 schematic diagram download
A long-standing community where technicians share List of Vivo Schematics and hardware solutions. Key Components in the Vivo U10 Schematic This is a professional paid tool, but they
Shows the path from the USB port through the ANA board to the battery. This is a professional paid tool
Details the voltage regulators (VDDC, DDR +1.5V) and standby power lines [+5V].
Maps the signal path for 4G/LTE and Wi-Fi antennas.