Repair of Huawei P30 mobile phone without charging

When measuring the related power supply of the charging chip, it is found that the AVDD voltage of the G8 pin is 3.9V, which is a little higher than the normal 3.3V.. After removal, it was found that the capacitor pad was dropped, and the flying wire was directly grounded.

Machine model: Huawei P30 mobile phone

Fault phenomenon: the mobile phone does not charge.

Maintenance process: after you get the machine, turn it on for testing. Plug in the charger and find that there is a sign on the screen showing charging lightning, but there is actually no charging current, so the mobile phone cannot be charged.

Maintenance of Huawei P30 mobile phone without charging Figure 1

Disassemble the machine, remove the motherboard, and measure that the value of the large inductor next to the charging IC is normal. By looking at the circuit diagram and point bitmap reference corresponding to Xinzhizhao software, it is found that the AVDD voltage of G8 pin is 3.9V, which is a little higher than the normal 3.3V..

Maintenance of Huawei P30 mobile phone without charging Figure 2

Maintenance of Huawei P30 mobile phone without charging Figure 3

When measuring the capacitance-to-ground value of capacitor C1631, it is found that one end of the capacitor should be grounded normally, but the actual measured value is infinite.

Maintenance of Huawei P30 mobile phone without charging Figure 4

After removal, it was found that the capacitor pad was dropped, and the flying wire was directly grounded, and the capacitor was installed, and the measured voltage was restored to normal 3.3V again.

Maintenance of Huawei P30 mobile phone without charging Figure 5

Start-up test, there is a charging lightning sign on the screen, and there is charging current at the same time. The current value is 1.6A Troubleshooting and maintenance are over here.