Tip & How-To about Dynex - Screen Protector for Apple iPhone 6 and 6s
IPhone 6S cannot pass the root process and reports error code 4013.
This iPhone was fixed before, so root it and test it. But it still reports the error code 4013. Observing the motherboard, we find the weld marks on motherboard baseband chip and baseband power chip, as shown in picture 2-37 and 2-38.
doing BGA Reballing Stencil again and weld the baseband chip as well as the baseband power chip. Then connect it to computer to root. We can see the white Apple logo appears and it gets stuck at the grey progress bar. Based on the repairing experience, we know that this kind of trouble is caused by NAND Flash IC. Use multimeterto test each power supply circuit of NAND Flash and they are normal. Remove the old NAND and replace it with a fine removed NAND Flass. It can enter activation interface, so we are sure the NAND Flash is damaged.
The faulty NAND Flash is shown in picture 2-39.
After replacing a new NAND Flash, it can enter the system normally. Trouble is removed.
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Posted by yong hui on
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