Wednesday 16 October, 2019 |

Solved: iPhone 6 doesn't boot caused by CPU error

The iPhone 6 doesn't boot after pressing the power button, the iPhone screen keeps black; and it doesn't respond to charging. After testing, it's not the iPhone screen or iPhone battery problem, so we suspected the problem is on the iPhone motherboard.

Use phone opening tools to disassemble the iPhone 6, and then remove the iPhone motherboard.

First connect the iPhone motherboard to the UNI-T UTP3305 DC power supply to check current, after measurement, the boot current is between 80mA and 100mA. After detection, the iPhone power supply, output, clock, reset and the condition of the iPhone booting all is fine. Therefore, we suspected it's the CPU problem, the iPhone CPU may be virtual welding.



Attach the iPhone motherboard to the PCB holder fixture, and then use Hot air gun and BGA graver to remove the glue around the CPU.

And then we can put iPhone motherboard on the T12A-CPU Groove for heating, and then use BGA graver to remove the iPhone CPU.



Clean the solder pad, put iPhone CPU on the QianLi Black Stencil CPU module, and then reballing the iPhone CPU. Apply some solder paste to the solder pad, finally install the iPhone CPU back to the motherboard.



Now assemble the iPhone 6, press the power button, the iPhone 6 can be turned on successfully. After entering the IOS system, test the iPhone functions, everything works well.



This video was shared by G-LON.

by Bellin

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