Why does my iPhone 4 screen keep blacking out?

See a few weeks ago it blacked out, and I questioned Page Plus about it; however, she said it was my hardware so I would have to pay $20. Before I payed a week later it came back on, thank God. Two days ago it blacked out AGAIN! But here's the thing, I can hear the screenshots, and I can hear when you plug the charger in. Advice?

Your LCD went out. That $20 is a good deal. I replaced upwards of a thousand iphone 4(s) screens and though I haven't priced them in awhile the screens used to be $35 and that didn't include installation. Id imagine that you'd now pay 80-100 to get it fixed.

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