Reasons for a black screen and responsive iPhone?

[iMore Question]

Today I scrolled in some apps and suddenly my screen turned black - like the iPhone shut down due to low battery.
I tried everything the internet says:
- Hard reset (holding both sleep and home for 10 sec/30 sec, holding sleep for 5 seconds then add the home for 10/30 sec)
- Software update
- Restore
- Factory reset via recovery mode
I can receive calls and by guessing where the slider is, I can answer the call.
Before I did a fac reset, I managed to sync the device with iTunes, by remembering they location of the code digits and approx location of the confirm button for the authorization of the computer. Still a no-go.
Anyone got any idea what can I do about it? What might be the cause?

 

[kataran]

Sounds like a hardware issue. You need to take it to an authorized shop or if it's still under warranty take it to an Apple Store