Have you checked all of the connections (img 3 on this link http://www.modaco.com/topic/335578-howtochange-the-digitizer-screen-zte-blade/ )? Screens are made of two parts - digitizer and LCD, so it might be that your replacement only has the LCD part
@branwen started
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Have you checked all of the connections (img 3 on this link http://www.modaco.com/topic/335578-howtochange-the-digitizer-screen-zte-blade/ )?
Screens are made of two parts - digitizer and LCD, so it might be that your replacement only has the LCD part