iPhone 7 WiFi cannot be opened for repair

Machine model: iPhone 7

Fault: WiFi cannot be turned on

Maintenance process: damage to the general function module will also cause short-circuit current battery die more quickly. After testing, WiFi can’t be turned on, Bluetooth can be turned on, compass can’t be turned on, and the backlight is still dim when the backlight is adjusted to the maximum brightness.

iPhone 7 WiFi cannot be opened for repair Figure 1.

Take apart with the power adapter power on really abnormal,switch 100 more than jump.

iPhone 7 WiFi cannot be opened for repair Figure 2.

Remove the motherboard and check. It turns out that this is an water damage machine. You can see corrode right next to WiFi.

iPhone 7 WiFi cannot be opened for repair Figure 3.

After cleaning the place of corrode with Cleaning solvent, and then deducting Capacitor which has been corrode, the power on test will still jump short-circuit current more than 100 times. It is found that there is a small Capacitor corrode under the compass, and multimeter has measured to the ground.

iPhone 7 WiFi cannot be opened for repair Figure 4.

Directly put Capacitor off, and then measure Diode value is normal. The power on is normal. Install the main board to test WiFi and turn on the compass. The backlight is too dark for the screen. Troubleshooting!