@fixing.tips: Little notes for technicians VBAT / PP_BATT_VCC: Main battery power line—check this first when diagnosing power problems. VBUS / PP_VBUS: Usually related to USB/charging power. VDD / PP lines: Different power rails supplying specific circuits such as CPU, LCD, touch, camera and memory. GND: Ground/reference point used for measurements. IN / OUT: Indicates whether a signal or voltage enters or leaves a circuit. EN: Enable signal that turns a circuit or IC function on. FB: Feedback line used by power circuits for regulation. No voltage? Check for open lines, damaged coils/fuses, short circuits or a faulty power IC. Always check the schematic for the exact phone model because circuit names and values can differ. Use a multimeter carefully before injecting voltage or replacing an IC.

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Friday 21 August 2026 12:14:02 GMT