iPhone 5S black screen but ammeter has response

Could you still worry about iPhone 5s black screen but ammeter has response in sometimes? Maybe your iPhone 5s appeared call failure, especially during charging, the signal disappears suddenly and the iPhone fails to call even with signal. This is detrimental to your daily work and life. So, what can we do in the situation?

 Issue:
The ammeter has response when pressing power button but the screen displays nothing. When you replace a new display screen and it shows the Apple logo. Later, blue screen shows up and iPhone reboots.

 Fix process:
1. First, remove the motherboard and wire without connecting the power button Flex Cable. IPhone can be turned normally. 

 2. Then, replace a new power button FPC Cable and the problem still the same. Adjust the mute switch to set a mute state and iPhone will reboot after showing the white Apple logo and blue screen. It will be turned on normally under non-mute state.

 3. Finally, This problem is strange and has not been met before. According the repairing principle of software first and hardware later, enter DFU mode to root. After root, iPhone can be turned on. 
Trouble is removed. Welcome to visit vipprogrammer.com.

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