top half of screen is darker with blue color lines running down

[Richard Owens]

How do I fix it? Can I? Outside screen is fine.
HTC thunderbolt

 

[Va1ha11a]

I think this is a hardware issue, maybe water got inside the phone? If you're feeling adventurous, you could try replacing the screen (Here is one for 13$) using This tutorial. If not, I think you'll just have to buy a new phone or put up with it.

 

[Devinator]

Yea, probably hardware. To be sure, you can factory reset.

If that doesn't fix it, is it under warranty, or, at least insurance? If so, might be time for a new phone.