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HUAWEI P20 can’t be turned on
Model: HUAWEI P20
Failure: HUAWEI P20 can’t be turned on
Repair process: get the phone for boot test, press the boot button, and the phone won’t start.
HUAWEI P20 can’t be turned on Figure 1.
Remove the mainboard from the machine and connect the mainboard with the repair power supply. The current directly shows about 500mA. In this case, there is a short circuit in the mainboard power supply. Measure the resistance of motherboard power supply to ground, and find that the VDD_BUCK_BOOST power supply is short-circuited to ground.
Fume the motherboard with rosin, and then connect the 2V voltage VDD_BUCK_BOOST power supply to burn the machine. The capacitor on the edge of WiFi is damaged, so the short-circuited capacitor is removed, and the motherboard is measured again, and the fault is repaired.
HUAWEI P20 can’t be turned on Figure 2.
