My husband's HTC Evo Shift took a swim in some iced coffee and the touch screen doesn't work at all anymore. I did a full factory reset, which didn't accomplish anything. The screen doesn't respond at all. I can flip it open and use the keyboard, but that's not hardly convenient.
So ... what do I try next? I'm game to experiment -- he got a new phone. I just can't accept that this one is kaput.
Try Settings->Developer Options->Show touchscreen touches. Unfortunately, HTC likes to move these settings around between versions so I don't know if it will work for you.
Replacing the digitizer is possible on many HTCs, I did it on my EVO 3D. But that's probably what has failed. Condensation will confuse it and make it stop functioning .
There's probably moisture in the device. If so, you need to take it apart and clean it (and maybe replace some parts): https://www.google.com/search?q=teardown+htc+evo+shift
