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A8 CPU issues: get solution to fix iPhone 6 A8 CPU

An iPhone 6 accidentally dripped into water, and  then it has something wrong.  What's going on?  We need to check it, and get solution to fix it.

After checking, the error details are UMT board can't connect with 80mA,  measure the reset data, it only has 0.8V,  and it is no short circuit after measuring the value.  Replacing the  iPhone USB Control IC (U1700),  iPhone display touch IC (U1501) and replacing PMU, the result is same, resistance value is also normal. 

Now, we remove the A8 CPU, the reset value is normal 1.8. However, after install the CPU underlayer, the data is lower again.  We judged the iPhone 6 CPU is damaged. The reset pullup resistance R0206 is 100K, and the voltage becomes 1.6V after the change of the 2.2K resistance.


 The upper cover current is a little higher, and the  iPhone screen is not displayed when install to test the iPhone 6 device. The  1505TA DC Power Supply required for the measurement screen is normal, connect Ace assistant which shows "please unlock the device", so it indicates that the system has been entered, and the failure is from CPU. Then PP1V0 is measured short circuit, a few points  on CPU are all short circuited. Now, we have to install the CPU back.

Directly connect 1.0V to this point, the current is 350A and the voltage is 0.8V. It seems hopeful, so we connect it with PP1V2_SDRAM directly.

Finally, assemble the iPhone 6, and reboot it, now the iPhone Display Touch Screen can be lit smoothly, and the data is kept. 





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