My iPhone4 also dropped in water for 15 minutes. Afterthat tookup iPhone and turn off first, second step i did shake softly my iPhone4 to clean up water. thirdly i open all parts one by one & cleaned with alcohol. 48 hours i kept for drying. Today when i tired to iPhone4 motherboard / logic board connected battery connector i found getting hot? I'm now worried to connect with battery if burned logicboard cheaps or something happen. Need suggestion and help to solved it out. Thanks in advance.