Let me know your exact goal (e.g., “find short on Vbat,” “identify a capacitor,” “reball CPU”) and I can give you targeted, schematic-free troubleshooting steps.
However, I must let you know: for modern Nokia smartphones (even models like the C30, released in 2021) are rarely released publicly by the manufacturer (HMD Global, under license from Nokia). Unlike older Nokia feature phones, these are proprietary and confidential. nokia c30 schematic diagram
I understand you're looking for the for the Nokia C30 — presumably for repair, component-level troubleshooting, or educational purposes. Let me know your exact goal (e