Phone screen stays dimly lit in standby mode

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http://forums.androidcentral.com – Earlier today u dropped my phone in water I quickly retrieved it and it's working perfectly but for some reason why I put my phone in standby I gets a dim Grey in the corners and a thin white line on the top and bottom and instead of being completely black the whole screen is like a dark Grey, and I'm wondering if there is anything I can do to prevent this, because it will obv decrease Mt battery life and will probably be harmful to the screen (HowTos)