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Pp-var-usb-rvp 〈4K〉

: If you use a thermal camera, you might see heat concentrated near the charging IC or surrounding capacitors like How to Diagnose and Repair Technicians often use a multimeter in diode mode

: Technicians typically measure this rail for correct voltage levels during the boot sequence or when a USB-C/Lightning cable is connected. pp-var-usb-rvp

E --> G[Protection Resistor R3335]

: In many cases, the phone will only draw a minimal current, such as , indicating a failure in the power negotiation stage. Wireless Charging Still Works : If you use a thermal camera, you

| Power Rail | Primary Function | Typical Voltage | Managed By | | :--- | :--- | :--- | :--- | | | Variable power for USB PHY and controller logic | 0V to 5V, dynamically controlled | PMU / Tigris / Hydra IC | | PP_VBUS1_E75 | Raw 5V input from the Lightning port's VBUS line | 5V (constant when cable is connected) | Directly from cable | | PP3V0_S2 | Fixed 3.0V for low-power sensor and logic circuits | 3.0V (always on in some states) | Main PMU | | PP_ACC_VAR | Variable power for connected accessories (varies by model) | 3V to 5V | PMU / USB controller | Therefore, is a dynamically controlled power rail that

As the table shows, PP_VAR_USB_RVP is unique because it is a derived variable rail that depends on the presence of PP_VBUS1_E75 for its operation, but it is controlled by the device's internal logic to manage communication.

Therefore, is a dynamically controlled power rail that supplies the USB controller and related circuits to manage both charging and data synchronization.