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Why is my screen encountering ghosting problems?

My Lumia 520 has started showing some ghosts of anything which was currently being displayed even for little time.it persists for some time and then new ghosts appear of the then current screen.it is not visible in a screenshot.plss help me...

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Hi there has the screen been replaced at any time? sounds like a low grade lcd, or the lcd may be deteriorating so will need replacing.

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ayankesh mallick crwdns2934231:0crwdne2934231:0
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