Screen only turns on a low battery

I have a sprint Nexus S 4g. It recently got wet and i let it dry out for a day. The screen is slightly cracked, but before getting wet, the screen still worked properly. Currently, my phone will turn on and i can confirm this through the use of droidscreen, which displays the screen. Using adb, i can still input taps but the screen remains black. Even though the screen is black, the screen still registers touches and i can still open apps, open the notification bar, etc. I let the battery die recently. When i started charging again, it displayed the charging animation when off. I turned it on, and it did not show the boot animation, but the screen turned on at the home screen (since i do not use a lockscreen, and i mostly use this device for a hotspot). The power was at 1%, so i let it charge. When i came back to it a few minutes later, the screen no longer worked again. I have been able to recreate this and i do not know why the screen only displays at around 1%, but still registers touch at any time. Could replacing the screen fix this issue or is this a result of water damage in the circuitry?
This device is rooted and is currently on CM.

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