How to repair iPhone 7P white Apple restart and error 9？
What should I do if I encounter an iPhone white apple failure? Our customer sent an iPhone 7P, the fault described is that the iPhone fell into the trash, it can be used normally on the first day, after a day, the iPhone always restarts at startup and it does not enter the IOS system.
Now, the customer sends the iPhone 7P to us for repair. The iPhone's failure is the same as the customer's description. The iPhone is refreshed and iTunes reports an unknown error of 9 (the progress bar only flashes once and then reports an error).
For iPhone 6S and later, the unknown error 9 usually is caused by iPhone Nand flash and iPhone logic epprom IC. Measuring the power supply of the iPhone Nand flash by digital multimeter, the 3V, 1.8V and 0.9V all are normal, and the iPhone Nand flash and iPhone logic epprom IC didn't been repaired, but the iPhone baseband part did. Leave it alone, now we try to fix it by replacing iPhone Nand flash, after replacement, it still reports unknown error 9, then it may problem of the iPhone logic epprom IC. Directly replace the iPhone logic epprom IC, after replacement, it still reports unknown error 9.
What's the real problem? We think that when the resistance value of the two resistors that connected to the logic epprom IC is too large, it will also reports error 9, try to replace these 2 resistors. Remove the iPhone logic epprom IC and the resistors that connected to it, and then with the help of the QUICK 861DW hot air rework station and Titanium Alloy Tweezers, we replace all of them.
After replacement, re-flash the iPhone, now the process bar is running normally, which means the iPhone baseband part is no problem, the iPhone is basically repaired. When the flash is finished, the problem has been repaired smoothly.
If you have any questions, please contact me at www.vipprogrammer.com.
Now, the customer sends the iPhone 7P to us for repair. The iPhone's failure is the same as the customer's description. The iPhone is refreshed and iTunes reports an unknown error of 9 (the progress bar only flashes once and then reports an error).
For iPhone 6S and later, the unknown error 9 usually is caused by iPhone Nand flash and iPhone logic epprom IC. Measuring the power supply of the iPhone Nand flash by digital multimeter, the 3V, 1.8V and 0.9V all are normal, and the iPhone Nand flash and iPhone logic epprom IC didn't been repaired, but the iPhone baseband part did. Leave it alone, now we try to fix it by replacing iPhone Nand flash, after replacement, it still reports unknown error 9, then it may problem of the iPhone logic epprom IC. Directly replace the iPhone logic epprom IC, after replacement, it still reports unknown error 9.
What's the real problem? We think that when the resistance value of the two resistors that connected to the logic epprom IC is too large, it will also reports error 9, try to replace these 2 resistors. Remove the iPhone logic epprom IC and the resistors that connected to it, and then with the help of the QUICK 861DW hot air rework station and Titanium Alloy Tweezers, we replace all of them.
After replacement, re-flash the iPhone, now the process bar is running normally, which means the iPhone baseband part is no problem, the iPhone is basically repaired. When the flash is finished, the problem has been repaired smoothly.
If you have any questions, please contact me at www.vipprogrammer.com.
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