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SIr recently i dropped my iphone 6 into the pool . i imediately recognized and i tried to switch off my phone but i failed the water enter into the display and entire scrren goes out .after that i dried my phone . after that i turned on my phone the display is black and phone turns on.. i heard the sound when i plugged into the charger. i thought display has been damaged and i brought a screen and tried again now again the display is black and i replaced the screen once again the same problem exists. i cannot connect to itunes because i put a passcode so it is not connecting to the computer.sorry for my poor english . thank you in advance
Not bad English at all you have done well. Considering you have already tried screen you are most likely to have cosion around screen connector or your backlight or display has been shorted. Best to get it looked at by a board level repairer that can fix this. Most board level repairers will only work on liquid damage for data only as phones are never stable after liquid has entered the phone.