How to fix iPhone 6 show Power current 70mA can’t turned on

Your iPhone will not turn on and you’re looking for help. It’s a problem that can be easy or difficult to fix, depending on the cause.In this article,A customer's IPhone6 after triggering it on, the turn on current is 70mA. This customer used iTunes to root it, but the root did not pass and iTunes reported error 4014.

Repair Process

Customer himself used air gun to heat CPU. When connect computer to root, computer reports error 4014. In general, error 4014 suggests that CPU, Temporary Storage is more or less faulty or the power supply circuits are faulty. After removing the motherboard, we find that around the shield cover of motor drive chip U1400 there is some erosion mark, as shown in picture 5-41.

Picture 5-41

Removing the shield cover, we can see that U1400 is eroded. Picture 5-42 shows erosion situation of the enlarged motor drive chip U1400.

Picture 5-42

Clean the eroded places and replace U1400. Now iPhone can be turned on normally. The motor drive chip U1400 in Schematics Diagrams is shown in picture 5-43.

Picture 5-43

The damaged U1400 leads to the poor working condition of I2C bus and computer reports error 4014.


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