What should I do if my iPhone 6 suddenly has a white screen and cannot be turned off?

Hello, the method to solve the problem of sudden white screen on your Apple phone and unable to shut down is as follows:

1. Download, install and open itunes.

2. Let the phone enter recovery mode:

1. First, press and hold the power button. When the shutdown option appears, slide to shut down;

2. Then Press the power button again to turn on the computer. The Apple logo will appear on the screen. Do not release the power button;

3. Then press and hold the Home button until the screen goes black;

4. When the screen When the screen is black, please release the power button and continue to hold the Home button until "An iPhone in recovery mode has been detected" appears in iTunes on the computer; Note: If you cannot enter recovery mode, please do it a few more times.

3. Click to restore the iPhone and wait for itunes to download the latest firmware and install it. The iPhone will automatically turn on and can be used after activation is completed.

Hope this helps!