Water damage has caused strange symptoms- what could be the problem?

Hey guys,

So, I accidentally dunked my phone in a vat of sea water, and after a hour of use it has turned itself off. It was a good enough hint that I should educate myself a little, which I did and realized my folly.

The next step was to take the phone apart and assess the board for corrosion's greenish/white stains. There were a few, so I dunked the board in a vat of IPA 99%, wiggled it for a little while, wiped of with a soft brush and a microfiber cloth, washed it off with distilled water, let it dry, and finally have inspected it again. It would seem to me that the stains were removed so I've reassembled the phone back.

After charging the battery and powering the phone on I've gotten some strange results:

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-When you press the 'ON' button for a few seconds the screen remains black but after a certain wait you get the lg reset music and a vibration.

-If you touch the 'home','back' or 'settings' buttons for a few seconds, the phone vibrates.

-If you touch the black screen for a few seconds, then sometimes the phone vibrates and sometimes it doesn't.

-Occasionally if you touch the screen the speaker would make a clicking sound (like with regular pressing).

- At my first power on the phone started to play the last youtube video I was watching, but after removing the battery it has stopped doing that.

- At my first power on when the youtube video has started playing, I couldn't control anything else, but I think I could rewind he video... or maybe i couldn't and for some reason it was on a loop (like some piece of information stuck in the ram and replaying itself over and over).

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I'm not sure where the problem could lie and ordering spare parts for no reason is too expensive.

If it's the screen that's short circuited then why does it still respond to my touch?

If its the logic board, then where exactly could be the problem? Is there a way to check which component on the board is not right? Maybe somehow with a Voltmeter?

I would like to use that specific phone in order to recover my files and contacts.

Thank you very much!