USB Data Positive/Negative (DP/DM) lines, sub-board flex, and charging IC.
For effective repairs, you need both. The schematic tells you what to look for, and the PCB layout tells you where to find it.
Unlike a visual photograph of a circuit board, a schematic does not care about the physical size or placement of the component; instead, it focuses entirely on the logic of the electrical flow. It tells you which pin of the USB-C connector leads to the Charging IC, and which capacitor filters the signal before it reaches the CPU.
The most reliable sources for genuine schematic files are technician forums. These platforms scan files before publishing.
Without this diagram, repairing dead boot, no display, or water-damaged Realme C11 devices is nearly impossible.