SOLVED: iPhone 6 Shows Activation Without WiFi Fault

We are going to repair a iPhone 6 today, the customer described the failure was that the WIFI can not turn on, after the removal of WIFI, the activation interface appears. Connect to test we found that the iPhone 6 WIFI chip was not installed, the data cable is not installed in the boot-up activation mode,when we connect Aisi assistant we found a serial number without baseband.

It enters into the activation mode again after using for a while , which is usually baseband power output short circuit based on our usual maintenance experience. Considering the WIFI removal situation, associated with the WIFI edge of the GPS power amplifier has a voltage output baseband power.

Measure with a FLUKE digital multimeter, it's PP_LDO13 as shown in picture.20-2-1



After eliminating the short circuit, the result is that the C5129 is broken, the resistance is back to normal, connecting Aisi assistant we find the baseband out. Using Ace assistant to skip WIFI, activate the backward menu again and use it properly. 20-2-2



Now let's fix WIFI. It's OK to measure the resistance. Install it on a WIFI and find it still hard to turn on. After borrowing 1.8V to reset, it is found that the WIFI address appears, but still can not turn on it. Use the Digital Storage Oscilloscope(VC211) to measure the 32K clock test point we found no waveform.

The clock is from the main power source, so we replace the main power to measure again.

Now the waveform appears, test WIFi again, the fault is successfully solved. 20-2-3




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