: Likely stands for Low Voltage . It differentiates this rail from high-voltage lines (like those for a backlight) or standard logic levels.
: Stands for Positive Plane . This indicates a power line or "rail" that carries a specific voltage across the board. PP LV Jmp4
Based on common technical schematics (particularly for or iPhone logic boards), "PP LV Jmp4" is a shorthand label for a specific power rail or jumper point. : Likely stands for Low Voltage
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