Without the schematic diagram, diagnosing these problems involves guessing. With the diagram, a technician can trace the circuit to the exact resistor or capacitor causing the fault.
Use the schematic to locate the display power supply lines (usually VSP and VSN , which should measure +5V and -5V respectively).
A great place to start is with the phone's official technical specifications. The OPPO A15's internal model number is , a crucial detail to have on hand before searching for any guides. This device is built around a MediaTek Helio P35 (MT6765) chipset, and it's important to note that schematic documents are tailored to this specific chipset.
When you open an Oppo A15 schematic PDF, the document is generally divided into functional blocks. Navigating these blocks efficiently ensures a faster diagnosis. Power Sequence & PMIC Block