Phone screen shows a vertical blue streak after cleaned water damage?

I equipped my phone with a lifeproof case (I suspect that was my first mistake) :( and proceeded to use it in a pool. Inevitably water leaked in and it died. I put it into a bowl of rice until a couple of days later when I cleaned the logic board with a toothbrush and solvent, I successfully removed all corrosion... at least I believe I did. Yet, my phone will now only show signs of life when it is plugged into a charger, and still it only shows the time and percentage of battery life on the top of the screen. The rest of the screen is black except for a dark blue vertical streak. I think the battery is fine but I will soon install one that I know for a fact works, but still does it make sense that my phone would show signs of life with a battery problem? Any ideas on what would be the culprit of the elusive blue streak? Please Help!!