How to Reboot Repeatedly after Boot for iPhone 6 White Apple
As a repair staff, you must know that White Apple logo reboot is a common problem for iPhone, here is the case, after turn iPhone, the iPhone 6 shows white Apple logo and then reboot repeatedly, we can't get into IOS properly. There are many reasons causes this problem, including software and hardware. For the software issues, it's easy to fix it by software solution. For the hardware issues, we need to fix it by hardware solution that with professional phone fix tools and skills, it is more complicated.
First we try to fix it with software solution, if it works, then iPhone 6 reboot failure is caused by software issues.
1. Force restart iPhone 6
If the iPhone stuck on white Apple logo and then reboot, we can try to fix it by forcing restart, and force restarts are very simple and it doesn't require iPhone fix tools and skills.
In order to force restart iPhone 6:
- Please press and hold the Home button
- While holding the Home button, press and hold the Sleep/Wake button
- Continue holding both buttons for about 10 seconds, until the Apple logo appears
After for a while, if the iPhone still doesn't boot successfully, then we need to try next solution.
2. Update IOS
Sometimes, iPhone IOS system also can cause this problem, and for system problem, Apple always likes to fix it by IOS updating.
In order to udpate IOS:
- Connect iPhone 6 to the computer by iPhone lightning cable
- Open iTunes on computer and update it to latest version
- Select your iPhone 6 when it appears in iTunes
- Click update IOS if it is available
After update IOS, if the iPhone still doesn't boot successfully, then we need to try next solution.
3. DFU restore iPhone 6
DFU restore iPhone can deepest fix software issues, because it will erase all data and settings on iPhone. And for this reason, you need to back up your iPhone 6 before you are going to restore it.
In order to back up iPhone 6:
- Connect iPhone 6 to the computer by iPhone lightning cable
- Use iTunes to back up the iPhone 6
In order to restore iPhone 6:
- Make sure the iTunes is latest version
- Press and hold the Sleep / Wake Button and Home Button together for few seconds
- Release the Sleep / Wake Button but continue to hold the Home Button until iTunes says “iTunes has detected an iPhone in recovery mode.”
- Let go of the Home Button or volume down button
- Restore your iPhone using iTunes
After restore iPhone 6, if the iPhone still doesn't boot successfully, then we need to use hardware solution.
4. Disassemble the iPhone 6
Most of the iPhone reboot problems are caused by iPhone logic board failure, in order to fix iPhone logic board, first we need to disassemble it.
Carefully disassemble the iPhone 6 by phone opening tools, and then take out the iPhone logic board.
5. Measure the iPhone logic board
Use digital multimeter to measure the diode data for iPhone 6, we find the I2C bus pull-up resistor R0316 and R0317 of fingerprint chip U3001. The diode data of RO317 is about 400 while R0316 is 730. The data for RO317 is obviously larger than normal data.
After check iPhone schematic diagram on the WUXINJI Dongle, we know that the signal of the two resistor flows to CPU, so we can conclude it is CPU failure.
6. Repair iPhone logic board
With the help of the QUICK 861DW hot air rework station and tweezers, we can remove the iPhone CPU quickly and correctly.
After remove the iPhone CPU, we found there is a disconnection, use QUICK 861DW hot air rework station to solder the jumper wire, and then install the CPU to the logic board.
Measure the iPhone again, the data tested is normal.
At last, install the iPhone, and then press the iPhone power button to turn it on, now the iPhone 6 can get into the IOS system successfully.
