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if you could open the keypads, you can clean the surface of the defective key. probably some tea residue builds up on the key and causes it to malfunction. you can search on utube on how to open your laptop keypads.
1st thing to do take battery out to stop power do you no how to take phone apart? if no there is a website that shows you cause dry it with a cloth then go over it with a toothbrush and leave for 12hours and see what happens then
Since you dropped it in a liquid, you gotta let it AIR out for about 1-2 hours then check your 'Battery' If a lil white sticker on the back of the battery changes color that means your phone is liquid damaged, if not then you gotta purchase a new keypad because the tea had seeped into it & ruined it.
Try this: turn off the phone & let it charge for 48hours, that will give it enough time for the electricity to dry out the internal circuitry in the phone and possibly fix your internal antennae problem...if that doesn't work then your phone's tea bath may have shorted the antennae.
i had a i730 that i drop in water i took it apart an took the blow dryer set it on hi about 8 to 10 " away from the parts put it back together it work just fine till i drop it out of the window of the mail truck. yes you can buy the main board
ps the i880 is a lot easier to work on then the i730