iPhone 7 Plus WiFi does not open troubleshooting

Machine model: iPhone 7 Plus
Malfunction: the mobile phone WiFi can’t be turned on.
Maintenance process: enter the setting interface runs slow, no WiFi address.

iPhone 7 Plus WiFi does not open troubleshooting Figure 1.

After removing the mainboard, it was observed that there were traces of falling, especially the deformation of shielding cover in the upper part. According to past maintenance experience, it was judged that WiFi had pad break off.

iPhone 7 Plus WiFi does not open troubleshooting Figure 2.

When the chip is removed, it is found that there is copper leakage on the motherboard. After reinstalling WiFi, there is still no WiFi address. Then, you can only replace WiFi, remove Nand and untie it.