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Ive dropped my iphone5c and now have a blank screen is it broke?

You have a broken LCD from what you are describing. Pretty common when the glass separates from the plastic frame causing LCD damage. Here is the link for the part: iPhone 5c LCD and Digitizer Here is the guide on how to do the repair: iPhone 5c LCD and Digitizer Replacement Do this and you’ll phone will be good as new in no time.