Thursday, October 12, 2017

SOLVED: No response when the iPhone 6S is powered on



 The iPhone 6S accidentally fell to the ground, and then it has no reponse when boot it.  Online state is not normal, drive also displays incorrectly, as shown in picture 1, this phenomenon is usually caused by virtual soler on CPU. This device was fell over by customer, so we can judge that the reason must be the virtual solder. 

After soldering CPU with solder station, the iPhone 6s can be normal online, but it displays error 4013 when flashing system.

The error 4013 is reported when the progress bar just appears on screen, as shown in picture 1.


For iPhone 6S device, if this phenomenon happens, which are generally baseband problems, so we remove the baseband, indeed some tin points come off. 


Make jump wire on the disconnected but useful pin, install chip on it, but it still shows error 4013 when flashing, seems there is still a problem exist. Rooting the device repeatedly, we find when white apple appears, baseband S3, S4, S5 voltage can be instantly measured with power supply besides S2, but we still can measure the ground value on S2, is it the baseband power failure? Remove the baseband power supply chip, by the way of measuring its pin, it is found that the 91 and 97 pin of the baseband power supply IC are blocked. so we can see the problem has been found here. Remove the inductance, its pin has been damagd. The front is good while the reverse falls a pin. 

So we replace the damaged parts and install original fingerprint, the progress bar is normal when flashing now. The repairs ended here!

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