If you are a technician needing this for a repair:
Search for "Charging IC" or "PMIC" using the built-in PDF search feature (Ctrl+F).
A comprehensive source for Oppo service manuals and hardware repair solutions. Borneo Schematics
The OPPO A15 uses a complex power tree. The exclusive PDF details the exact voltage output for:
often host technical PDFs including PCB layouts and component maps for various Oppo models. Technical Quick Codes
It sounds like you're looking for an (likely in PDF format), possibly for repair, circuit analysis, or educational use. I should clarify a few important points: