Ok long story short, I goofed and dropped my s4 into a cup of coffee. It was submerged about 1/3 of the phone , on the top portion of the phone. I removed it immediately, pulled the battery and used a small vacuum to suck out as much of the liquid from the phone before i opened it up. Im pretty good with these kinda projects and have fixed many a phone over the years for friends who busted their screens etc. I hadnt been inside an S4 before this though, so i approached with caution. I used alcohol and a lint free microfiber brush to clean off anything that had coffee on it. All and all everything went pretty smoothly. After cleaning i put the phone in a bag of rice and silica gel for a few hours then put it back together and turned it on. It loaded up quick as usual, everything was pretty normal. But suddenly the screen would stop responding to my touches for a few seconds, and then start working again. So i turned it off, took it apart again and dug a lil deeper. I cleaned off all the contacts for the ribbons, and anything else that had any kinda sticky coffee residue on it. I put it back in the bag last last night and opened it up today and reassembled it. Turned it on , and like magic, everything was great! well 99% great. The phone is acting like it always has,and no more screen unresponsiveness or anything like that. All except for a small sliver of the top of the screen under the Samsung logo. Just a tiny sliver of the screen doesnt respond to my touches, which is a big pain in my butt because its just enough to not be able to swipe down the pulldown menu, and in some games i play, i cant click anything thats on the very edge of the screen in landscape mode. The screen looks normal, no signs of damage like ive seen in other devices when digitizers become damaged etc. Just that tiny little line of screen wont pick up touches.
I only went so far as to taking out the mobo and looking underneath that. I know i can go deeper, and would have to if i needed to replace the digitizer, but before i go through all that, i figured id seek the advice of the XDA Gurus first. Is there possibly anywhere else that i missed cleaning out the junk a that could be causing the problem in that area? Ive been very careful thus far and everything is working accordingly, hell the headphone jack even works still and that thing was full of coffee!! And all the other problems after the initial cleaning have gone away,and im left with this little line of screen that wont read my touches!! So i must have done something right so far! Im hoping that maybe i just overlooked another possible place to clean up any leftover junk and then will get full function of my screen again. if not, then i guess ill be ordering a new digitizer sometime soon.
Thanks for your time, anyone who reads this. I hope to hear some good news *crosses fingers* soon, and get my phone working properly again.