How to fix iPhone 6 electric torch cannot be opened and flashlight cannot be used

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Trouble Phenomenon

According to the feedback from customer, flash light cannot be used. The iPhone has been fixed at other places. The maintenance personnel told the customer that no matter how many flash lights chip were replaced, they all would be burnt. After checking, there was a line that got into CPU short connected and CPU was broken. There is no way to fix it and the iPhone was returned back.

Repair Process

Turn it on and get into IOS to open torch, finding that the flashlight cannot be turn on. After removing motherboard, we find that there is no flashlight chip. Observing under microscope, we can see that some pins are missing on solder pad of flashlight chip. The location of solder pad is shown in picture 4-65. Then we call the customer and know that the previous maintenance personnel do not assemble the flashlight chip after tearing it down.

Picture 4-65

After counting under microscope, we know there are 8 pins missing. Previous maintenance personnel might worry about that high temperature would damage the CPU, so he violently pry up the chip.

Through schematic diagram, we know that the missing pins are earth wire, LED1 power supply and the pin used to auto-lift the voltage of flashlight chip, as shown in picture 4-66.

The flashlight chip is burnt because the pin used to auto-lift the voltage of flashlight chip is dropped.

Picture 4-66

Solder these pins under microscope and use BGA solder paste to solidify them. Assemble flashlight chip, as shown in picture 4-67.

Picture 4-67

Turn on iPhone and get into IOS to open flashlight. The LED can be opened normally. Trouble is removed.

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