Huawei nova4e has no signal repair

Machine model: Huawei nova4e
Customer description: mobile phone water damage no serviecs.
Test results: The mobile phone can be turned on, all functions are normal, and the SIM card no serviecs is plugged in.
Fault analysis: The fault of mobile phone caused by water damage may be caused by water damage corrode, the signal part of motherboard, which leads to water damage bit corrode pin. Open Xinzhizao Soft first, find the annotation drawing of Huawei nova4e, and find the main board signal circuit.

Huawei nova4e has no signal repair Figure 1.

Remove the motherboard of the mobile phone, and focus on checking the signal circuit. It is found that this circuit water damage corrode is serious. First, clean the circuit of corrode. After cleaning, carry out Repeat welding and Repeat welding chip on the components with serious corrode, install the test and repair the faults.