Touchscreen works badly after water drop

@nyankiller no! STOP! DO not do this “For now, I'll try traditional rice“ SKIP THAT! It is absolutely useless. It will not help you fix your phone. All it does it provides a false sense of security. It will not clean your phone, it will not prevent corrosion. Not sure why this is even still being mentioned. That myth has been laid to rest many years ago. For more info about that on here Don't Put Your Device in Rice. Here's Why...

“not very dangerous amount of water “ any amount of water is dangerous. It will deposit residues that are conductive and will shorten out your components.

First you want to 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. Disassemble your phone using something like this video . You must remove all EMI shields from the circuit board. 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 an Apple iPhone 3G, all the points are still pertinent to your phone. While you clean your board, check for any obvious damage, like burned or missing components etc. When it is 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 with a new battery and reevaluate. In your case you may need a new display assembly since your touch screen is not working but until it is cleaned, everything will only be a guess. Even with all this, water damage has only a small chance to be fully repaired, but at least you can give it a try.