Huawei 5G Nova6 mobile phone enters water without service repair

The measured capacitance of corrosion at startup is 1.8V, and the measured capacitance is 2.4V This circuit is connected to the signal chip of the main board, the upper board and the tail plug-in board. Redo this chip, and the power-on test voltage is restored to 1.8V. Boot test, perfect repair.

Machine model: Huawei Nova6 5g

Malfunction: Mobile phone is flooded with water without service.

Maintenance process:

A 5G Huawei nova6, the mobile phone is slightly corroded by water, and there is no service when it is turned on. It can find the operator, but it has been repaired or not. The water inlet machine has no service. Check each chip foot of the power amplifier and its power supply.

Huawei 5G Nova6 mobile phone enters water without service maintenance Figure 1

First of all, observe that the motherboard is not seriously corroded. The upper left corner of the power supply HI6421 in the lower left corner of the motherboard is slightly corroded.

Huawei’s 5G Nova6 mobile phone enters the water without service maintenance Figure 2

Open Xinzhi’s drawings and find that this power supply supplies power to the signal chip.

Huawei’s 5G Nova6 mobile phone enters the water without service maintenance Figure 3

Huawei’s 5G Nova6 mobile phone enters the water without service maintenance Figure 4

No small board is installed directly, and the voltage of this circuit is restored to 1.8V after startup.

Huawei’s 5G Nova6 mobile phone enters the water without service maintenance Figure 5

Remove the ground filter on the small board, and the fault remains the same. The voltage of the previous circuit is still 2.4V

Huawei 5G Nova6 mobile phone enters water without service maintenance Figure 7

According to the alignment of the 1.8V circuit on the main board, find the corresponding pin position of the small board seat. Once again, it is found that a connected chip in the lower left corner of the small board is slightly corroded.