Flackeri screen line screen problem

Turn off the phone, and set it with the charge port facing down for a few days, then try to turn it on. If it doesn't work still, you will need to open it up and see if it works after you get as much water out as possible.

@sami56111 Your goal right now must include the prevention of further corrosion. You can only do that by properly addressing the water damage. For now, stop continuing to try to charge, sync or otherwise use your phone. This potentially can make a bad situation worse. This may further damage your phone.

The next thing to do is to clean it. Next you will need to disassemble your phone. Since iFixit does not yet have any guides for that, use something like this video

Remove your main board, your charging board as well as the battery. You must remove any EMI shields from the circuit boards. If you do not remove those, you might as well not do anything. After you removed those, clean the whole board, connectors and all with +90% isopropyl alcohol. Follow this guide, and even so it was written for a 3G all the points are still pertinent to your phone as well.

While you clean your board, check for any obvious damage, like burned or missing components etc. I do no longer clean the charging boards. I replace those since they are fairly inexpensive and by replacing it, I know that it works. It will give you a known-well starting point in case you have to do further troubleshooting.

When your boards are properly cleaned, replace the battery. All these steps are to avoid delayed failure caused by corrosion. Best thing to do would be to clean it with an ultrasonic cleaner, but if you do not have access to one, this will at least help. Once all this is done, reassemble your phone and reevaluate. Until it is cleaned, everything will only be a guess. It is possible that you have a bad LCD and replacing the display assembly may fix it. Even with all this, water damage has only a small chance to be fully repaired, but at least you can give it a try.