Why did the display of HTC Desire 820s suddenly gone black?

It suddenly turn black without any reason.a mechanic said he don't know what just happen on it and there no official service center here so I am in a big trouble with this shot...

Hello. I am also suffering the same problem. I did a lot of method from the net but no luck but i found one way. I put my phone in front of our air contioning system and voila! It works. But after using and locking it, it returned to black screen. I can only use my phone through that method and i dont want to do that forever. Please help!

Hi azmain. Does the phone react when you plug it in to charge from your computer?

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