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Repair information and guides for the iPhone 6 that was released on September 19, 2014. Model Numbers: A1549, A1586, and A1589

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iPhone 6 can restore in recovery mode but nothing after that

I have a severely water damaged iPhone 6 which has corrosion on the top part of the board, the bottom part looks fine and not corroded. I have cleaned up as much of the corrosion as possible with 99% IPA but the display connector probably needs to be replaced and therefore nothing the screen is not working and does not display anything (although there could be another underlying issue). The phone is able to successfully restore in iTunes through recovery mode but does not show up in iTunes after that. As the screen outputs nothing, I cannot see if the phone has actually booted after restoring or is just bootlooping after that. I have transferred the logic board into the body of another working (but iCloud locked) iPhone 6 to test if the screen or battery were causing the problem. but there was no difference. PP1V8_LCM_CONN is outputting a stable 1.8V as it should and there is a normal amount of heat coming from the CPU and the baseband IC.

Is there anything I could do to diagnose the problem and find the issue? Any help would be greatly appreciated.

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With water damage, you have to decontaminate the logic board before doing anything else, preferably in an ultrasonic cleaner. The water is inside the phone, on the logic board and under the shields, even under the IC's which is why just a regular cleaning in IPA can be insufficient.

When dealing with a “dead” phone, there is no "silver-bullet" solution. You have to probe the board to get a better understanding of what is working properly and what is not. It may be a simple solution or a complex one. Sometimes we see a visibly blown cap, replace and all is well. Other times, everything looks perfect yet the phone won't boot.

You have to start at the beginning and check PP_BATT_VCC, PP_VCC_MAIN and PP5V0_USB. I would start by checking to see if those rails are shorted to ground. If one of these rails is shorted to ground, then you will need to identify what is causing the short. It could be a bad decoupling capacitor, conductive debris or defective IC that is directly supplied by those rails.

Then you move onto the PMIC and check the voltage rails it generates. The PMIC generates ~15 voltage rails. They are all important (for obvious reasons) but the ones to check first are as follows: PP_CPU, PP_GPU, PP1V8_SDRAM, PP1V2_SDRAM, PP_VAR_SOC, PP0V95_FIXED_SOC, PP3V0_Tristar, PP3V0_NAND, PP1V8_ALWAYS and PP1V0.

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