My Iphone screen is suddenly very hard to read. The light has disappeared after it had been wet.

My screen is hardly not readable anymore. The light has disappeared, probably after it got wet. Any idea about what I can do to fix it?

This is called "No Backlight Problem", most commonly assciated with water exposure.
Before opening and during any repair on the iPhone 3GS, the iPhone must be OFF or you risk more damage to your iPhone.
10% cause is due to faulty LCD Display, to determine test your LCD Display on another iPhone 3GS or try a new LCD Display on your iPhone. If your LCD is fine, then next step.
80% cause is due to 6r8 Coil on Logic Board. This 1 dollar part must be carefully removed and replaced (soldered) to Logic Board. If still No Backlight Problem, then next step.
10% cause is due to any number of Logic Board problems between the 6r8 coil and the #1 Connector on the Logic Board.

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