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iPhone 6 Keeps Restarting? – Fix Error 9 14 40
Feb 17th, 2017

 iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - fix iphone restarting, iphone lcd screenMore and more people reported that their iPhone stuck in a restart loop. The phone continuously restarts and became totally unusable, the Apple logo appear and disappear, over and over again.

Does your phone ever meet this common problem which drives you crazy? Now read our post to get some practical tips to fix this issue by motherboard repairing.

1. Take down the LCD screen assembly  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - lcd screen assembly
2. Test voltage of the battery with digital multimeter. Battery voltage is 4.21V, battery test signal voltage is 2.02V. The battery is normal, so we install the LCD screen assembly to check other malfunctions.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - iphone battery, iphone lcd screen, digital multimeter
3. Failure detection: connect the phone to computer, it could not be restored by iTunes, an unknown error occurred (9), so that we can draw a conclusion that NAND flash or CPU is cracked. iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - error 9
4. Detach the motherboard from the phone, and fix it on PCB holder.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - motherboard, pcb holder
5. Remove the NAND flash chip from motherboard carefully.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - remove nand flash
6. Clean the bonding pad with solder iron, knife, BGA paste flux, rosin, solder wick and PCB cleaner.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - clean bonding pad
7. Connect the NAND flash programmer with computer, transfer the data from the old NAND flash to a new one.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - nand flash chip programmer
8. New NAND flash chip BGA reballing.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - BGA reballing
9. Install the new NAND flash chip to the motherboard.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - install nand flash
10. Install the motherboard to the phone.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - install motherboard
11. Connect the phone to computer, it can be restored by iTunes successfully.  iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - iPhone restore
12. Test if it works well. iPhone 6 Keeps Restarting? - Fix Error 9 14 40 - function test

Tips:
1.Prepare a new 64GB NAND flash memory chip.
2.Error 21, 9, 2009, 4005, 14, 40 indicate NAND flash or CPU malfunction.
3.You may need to repair the CPU if the phone still keeps restarting after the NAND flash chip is replaced.

Tools Used:
64 Bit NAND Flash Programmer
Mobile Phone Repair Platform
Digital Multimeter
Soldering Iron Station
Hot Air Gun
PCB Holder
Screw Drivers
Tweezers

Video Tutorial

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4 responses to “iPhone 6 Keeps Restarting? – Fix Error 9 14 40”

  1. martin says:

    realy usefull.technology sharing good way. my oppenion make good prodect rewa company .can sale .nice and good

  2. Ahmed says:

    Hello Rewa team,

    I saw this video on Youtube, and I couldn’t help it not to approach you with appreciation for such an excellent guide.
    I have similar case of an iPhone 5s that was water damaged and now it’s stuck on apple logo blue screen loop of reboots. It has been sent to multiple repair shops for data recovery, but no luck, so memory chip off I believe might be the only hope.

    Do you think you can help with this? Let me know how I can contact you for this.

    Thanks in advance

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