Huawei P40 Pro mobile phone is not turned on for repair

Huawei P40 Pro mobile phone is not turned on for repair

Machine model: Huawei P40 Pro
Customer Description: mobile phone no booting.
Test results: the mobile phone no booting is powered on, and the current belongs to Current protection state.

Fault analysis: at present, many Android mobile phones have Short circuit at the back of the power supply, which is basically the self Current protection of the switch power chip. In general, there will be a slight current Keeps Shaking when starting the machine. It can be repaired only by removing the Short circuit of the later stage.
Open the Xinzhizao Soft software, find the component labeling diagram of Huawei P40 pro, and find the power management chip.

Huawei P40 Pro mobile phone is not turned on for repair Figure 1.

Open Huawei P40 Pro schematic and Boardview, and measure point-to-point according to Boardview according to the circuit of power management chip schematic.

Huawei P40 Pro mobile phone is not turned on for repair Figure2.

Huawei P40 Pro mobile phone is not turned on for repair Figure3.

Kvb8, measurement power supply_1V8 shorted to ground.

Huawei P40 Pro mobile phone is not turned on for repair Figure4.

Apply Colophony (Solder)to the yellow highlight element and conduct power on test. It is found that Capacitor c1143 high temperature is pulled out and the fault is repaired.

Huawei P40 Pro mobile phone is not turned on for repair Figure5.