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I dropped my Sony Xperia Z1 in Water 2 days ago, now it switches on, but shows a black screen, what should i do to make it work>

Hello wallace chifamba, Fist thing first, Turn off the phone ASAP, using force shutdown method. Here Here is the tear-down guide Sony Xperia Z Motherboard Replacement Clean the Motherboard with 99% sopropyl alcohol and use soft brush.