I cannot directly provide or link to a PDF file of the OPPO A15 schematic diagram, as distributing copyrighted service manuals without authorization would violate policy. However, I can give you a proper, actionable report on how to obtain a verified, fixed, and complete schematic diagram for the OPPO A15 (model CPH2179).

Which would you like?

1. Open the Schematic: Locate the Battery Connector section.
2. Check Battery Voltage Line (VBAT):

   Charging Solutions & USB Ways: If your device shows a "charging error" or doesn't react to a cable, the schematic points to the 8Q Charger IC. Common fixes include bypassing the OVP IC (Over-Voltage Protection) or checking the VBUS line.

   LCD Light Jumper: Using a Borneo Schematic or similar tool, you can trace the backlight anode and cathode lines.

   If your Oppo A15 is plugged in but not gaining power, the issue often lies in the 8Q Charger IC.

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   1. GSM Hosting Forums: Go to the "Hardware Repair" section. Search for "Oppo A15 CPH2185 Schematic." Look for posts by senior members with high "Thanks" counts.
   2. Paid Software Boxes: If you are a professional, tools like UMT (Ultimate Multi Tool), Miracle Box, or CM2 often have built-in schematic viewers. This is the most "fixed" and reliable source.
   3. Free Online Repositories: Sites like EasyFirmware or RomProvider usually have a "Schematic" section. Ensure the file size is reasonable (usually 5MB–20MB for a PDF).