The phone boot loops or gets hot near the charging port. Solution: The schematic provides a Board View (often included with the schematic). This overlays the circuit lines onto a photo of the motherboard. You can visually locate corroded components (e.g., a capacitor near the audio jack) and cross-reference its value in the schematic (e.g., "C5204 - 22µF").
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High-level overviews of major components like the processor, memory, and power management units. The phone boot loops or gets hot near the charging port