Droped phone in water everything works but the touchscreen
Touchscreen won't work
@smokedout you have not told us what you did about the water exposure and what you have checked to see about the digitizer. My suggestion would be that you deal with the water damage first. The very first step I would take is to disassemble your phone. Use these guides Samsung Galaxy A5 (2016) Repair or this videoto help you disassemble your phone. Take a careful and close look at all components and connectors. Truly assess the damage. Look for major corrosion, evaluate the pins in the connectors etc,. Take a look at all connectors as well as cable ends. You absolutely must remove all the EMI shields. If you do not remove the shields, you are not cleaning the board. Once you got the gross contamination cleaned, use 90%+ isopropyl alcohol and clean your parts some more. For a proper cleaning, use this guide iPhoneの水濡れ･水没ダメージからの復旧方法. It was written for an Apple iPhone but it is still pertinent to your phone as well. I can not stress the importance of a good cleaning enough, so do it over and over while replacing the alcohol after each cleaning. Do not use compressed air for the cleaning since that can drive liquid as well as corrosion particles into areas that will cause trouble later on. Also, you do not need to leave it to dry for a day. Isopropyl alcohol in the higher concentration will evaporate quickly and dissipate the water. The importance here is the cleaning. It would of course be best to get it professionally cleaned. Do not forget to replace the battery. This is a must and not an option. It will fail if you do not take care of it now. After that reassemble your phone and re-evaluate. For as long as you have not cleaned your board and replaced the battery, everything is just a guess. If the only thing not working after all this, is your touchscreen, replace the front display assembly ( of course if you have the right tools (LCD separator etc.) then you can just try to replace the digitizer). If that still will not repair it you have issues with the touch screen IC and circuitry on your board.
Possibly water started corroding your connections and found it's way to either the digitizer controller or the digitizer itself. Best shot would be an attempt to clean the corrosion on the connections with Isopropyl Alcohol, cotton swab and a toothbrush.
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