After you change battery the screen contrast often changes: it can become too light or too dark (your case).
To lighten screen
Let us try again.Put your finger on the button that is yellow orange with 2nd written on it, and press once.
Look for the group of four navigation keys with arrows (->) drawn on them.
Put your finger on the arrow key that points downward.
Keep pressing that key (the down arrow that is) until the screen lightens enough to your liking
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Well, this might not be right, but check the Brightness. Hit 2nd, then the down arrow. repeat this a few times. see if that works.
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