Trace the VPH_PWR line. The schematic will show you exactly which capacitors to test for a short to ground. Safety Reminder
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He connected the USB cable.
Before performing hardware repairs, you can use built-in engineering codes to test components:
[Visual Inspection] ➔ Check for water damage, corrosion, or cracked components. ↓ [Current Consumption] ➔ Hook up to a DC Power Supply to check the amp draw behavior. ↓ [Consult Schematic] ➔ Locate the circuit related to the symptom (e.g., Backlight). ↓ [Multimeter Measurements] ➔ Measure Diode Value and Voltages at designated test points. ↓ [Component Isolation] ➔ Remove or replace the faulty IC, capacitor, or resistor. ↓ [Final Verification] ➔ Re-test the circuit values before assembling the device. Summary Table: Vital Test Points for Vivo Y11 Diagnosis Circuit System Target Line Name Expected Value / Voltage Common Failure Symptom VPH_PWR / VBAT ~3.7V - 4.2V (Battery Voltage) Phone completely dead; full short circuit. Charging 5.0V - 5.2V Device won't charge or charges extremely slowly. Display VREG_LCM_1P8 Black screen; touch screen unresponsive. Backlight 15V - 25V (When screen is on) Image visible only under a bright flashlight.