More than likely you will need to replace the LCD screen. The backlight may have burned out making it blank.
A new LCD screen runs about 15 dollars shipped from
ebay.
The W580i LCD screen is very easy to replace. Probably one of the easiest I have ever done.
Check out the following link for instructions on replacing the LCD display and links to buy the screen.
Sony W580i LCD Screen ReplacementI hope that helps you out
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