Q: my iphone 5 suddenly has a white blank screen,  no liquid contact or history of fall, what can i do with this problem?

Hey there Galileo,

It sounds like your iPhone screen is solid white and you cannot do anything with it. Take a look at these steps from the following article about that kind of issue:

Get help with the screen on your iPhone, iPad, or iPod touch

If you see a solid color screen (black, white or blue)

 

1. Plug in your device to a power source. If you see the low-battery screen when you plug in, let your device charge for at least 10 minutes (20 minutes for iPad) before using it.
2. Reset your device while it's plugged in.
3. If resetting doesn’t fix the issue, restore your device.
4. If you still see the issue after you restore, contact Apple Support.

Thank you for using Apple Support Communities.

Regards,

Sterling