iPhone 6 WiFi can't be opened for repair

iPhone 6 WiFi can’t be opened for repair

Machine model: iPhone6
Malfunction: WiFi can’t be turned on.
Maintenance process:

I received an iPhone6, and the trouble described that the WiFi of the mobile phone could not be turned on. The test found that it would get stuck when entering the settings page. I drew a shortcut from bottom to top, and found that WiFi was really unable to be turned on.

iPhone 6 WiFi can’t be opened for repair Figure 1.
Dismantle the machine, power it on with DC power supply, turn it on normally, remove the motherboard and check it, and find that the WiFi chip has been replaced.

iPhone 6 WiFi can’t be opened for repair Figure 2.
Remove the chip and measure diode value at PAD point, and find 13 pin Measuring diode value OverLoad of PAD(more than 22401 401 normal OverLoad).

iPhone 6 WiFi can’t be opened for repair Figure 3.
This signal goes through a resistor r0711 to the CPU in the middle, and then the resistor r0711 has diode value. It is judged that it is not broken from the bottom of the CPU, from resistor r0711 Jump wire to 13 pin of WiFi.

iPhone 6 WiFi can’t be opened for repair Figure 4.

iPhone 6 WiFi can’t be opened for repair Figure 5.
After processing, install the WiFi chip, and the test shows that WiFi is not normal. Remove the chip again, and measure PAD diode value. It is found that diode value can be measured by applying force to 36 pin, but not by tapping.

iPhone 6 WiFi can’t be opened for repair Figure 6.
There is a test point in the middle of this line to CPU 32k CLK, directly from test point Jump wire.