Screen went completely blank
there is nothing wrong with your screen, the problem is
from the flex that connects your screen to the phone's main board. This
flex must have worn out that's why your screen is not displaying any
The problem is common with flip and slide phones. The
flex gets worn out as a result of constant opening and close of the
flip or slide phone.
I would urge you to replace the flex and I
am assuring you that your screen will display picture again. You might
also be lucky to find out that the flex is not well fix, that is, it
may have loosed contact.
If you cannot change the flex yourself,
maybe you should take the phone to a local repairer within your
vicinity, so that the flex can be fixed/replaced.