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I have just fixed an iPhone 6's screen for a Cutomer. And the screen is black. It works because iTunes recognises it.
Tried the old screen and also another screen and none of the 3 screens work.
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You may have blown the backlight circuit on the logic board. To be certain, shine a bright light on the screen after you connect it to an iTunes enabled computer. If you see a dim image, then the backlight circuit is damaged. This will require a micro-soldering repair.
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That's the thing, the display shows nothing! Yet iTunes recognises the phone. I have no idea what the issue could be.
Then you will need to look at the LCM Driver circuit (Chestnut).
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Take Diode Mode readings of the FPC's and compare to 1st image, check Filters for continuity...For backlight, pay attention to image 2, and for image, you can start with 3 - 5, but may also find LCM Reset, Photon alive, etc while looking through diode mode readings if off...
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sounds like you blew the backlight 99% of the time that happens because the battery was not disconnected during the repair
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Oh crap! How do I fix that?
you have to change the filter are you good with microsoldering?
I'm not good with it no. I don't even have the right equipment
where are you located? check shops around you or you can just send it in
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