I replaced the proximity sensor in an iphone 4 and now the screen won't come on. The phone does come on because when I plug it in it will vibrate. I installed another screen I had and even tried putting the old sensor back in but the screen won't come back on. I've also tried rebooting it. Is there something on the board that I could have damaged?
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Check that you haven't blown the backlight you can do this by holding the phone over a light and you should see the images on the phone very faintly.. Or check you haven't damaged the connectors on the motherboard
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try hard reset (home button + power button for 15 seconds), then restore, view board using a microscope to see if any iC are damaged, test screen on another phone, buy a new screen or board. If your in New Zealand you can buy replacement parts here Synced Repairs.
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