I have a Samsung Galaxy S4 that I had for a little over months before getting caught outside in a serious rainstorm. As I was pulling the battery out of the phone, I noticed the screen flicker. I pulled the battery and left everything in rice for a few days after the fact. Upon powering up, it appeared that the phone was still working, except for the display. It would buzz when I got an email or a text, and it would ring when called.
I'm fairly certain that my problem is simply that the LCD and/or digitizer has gone bad. I've found the replacement parts that I need to replace those, but before I drop the cash on it, I'd like to know for sure that everything is else is working as it should (camera, IR, wifi, etc).
I've found a couple of apps that do hardware diag, but since I can't really interact with the device, they aren't a lot of good to me. Does anyone know if there is any sort of hardware diagnostic that can be run through the ADB shell?