It is no doubt that people are happy to have a iPhone6 so high-end only mobile phones, but when equipment problems start to appear, many people feel very upset.
We find current 80mA circularly run while connecting and triggering with multimeter, so maybe its USB damgage cause I2C short circuit during charging process, first remove the iPhone 6 motherboard and take the USB off, but its still the same as before, then we measure the I2C resistance and power supply! It is found that the I2C 0SCL is in a short circuit state. As shown in picture 11-10-1.
Since its short circuit, it means the connected chip is damaged, the connected chips have di splay, backlight, main power supply USB and the iPhone 6 CPU.
First observe with microscope, it is found that all the backlight diodes are burning and discoloring.
Then remove the backlight first, it does not short-circuit. The trigger current is normal, so continue to replace the 3 piece of iPhone backlight chips.
According to our past experience, if the large inductors gets discoloring, the large inductors with connected backlight would also have problems, so we replace them together. As shown in picture 11-10-2.
After the replacement, the current is triggered normally, Install the USB to turn on the iPhone 6, the functions are all tested normally. As shown in pictur e 11-10-3.
We find current 80mA circularly run while connecting and triggering with multimeter, so maybe its USB damgage cause I2C short circuit during charging process, first remove the iPhone 6 motherboard and take the USB off, but its still the same as before, then we measure the I2C resistance and power supply! It is found that the I2C 0SCL is in a short circuit state. As shown in picture 11-10-1.
Since its short circuit, it means the connected chip is damaged, the connected chips have di splay, backlight, main power supply USB and the iPhone 6 CPU.
First observe with microscope, it is found that all the backlight diodes are burning and discoloring.
Then remove the backlight first, it does not short-circuit. The trigger current is normal, so continue to replace the 3 piece of iPhone backlight chips.
According to our past experience, if the large inductors gets discoloring, the large inductors with connected backlight would also have problems, so we replace them together. As shown in picture 11-10-2.
After the replacement, the current is triggered normally, Install the USB to turn on the iPhone 6, the functions are all tested normally. As shown in pictur e 11-10-3.
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