Still no response from my iPhone?

Two days ago I was cleaning my pool when I fell in for about 5 seconds. I got out and laughed about it, until about three minutes later I realized my phone was in my pocket, right then panic set in.

I had no idea what to do so I checked to see if the phone still worked by just hitting the home button, it did, but it looked like it was glitching and showing these small aligned squares in the middle of the screen (mind you the phone will still soaked when I did this). So the only thing I could think of doing was putting it in a bag of rice, while it was still on.. I'm a genius, I know. Once the panic settled down a few minutes later I then realize I should turn the phone off, when I went to do that there was no response, and I foolishly tried powering it several times. After doing some research I found rice was practically useless and just replaced half the rice with some silica gel packs to let dry. Once the camera looked like all the moister was gone I tried connecting my iPhone to iTunes, but once again, no response whatsoever (probably shouldn't have acted so fast considering it could still be wet inside).

I lost patience and hope at this point so I decided to take matters to the next level. I have some experience with repairs and builds so I'm fairly confident in deconstructing my iPhone, which would be a first. So now I've replaced my battery, and did an IPA wash for my logic board, removing pretty much most of the corrosion. After letting it dry in front of a fan for two hours, I reinstalled my logic board as well as the new battery, yet still no response.. not even from iTunes.

What could be the issue here????? This is killing me!