Released September 25, 2015. Model A1688/A1633. Repair of this device is similar to previous generations, requiring screwdrivers and prying tools. Available as GSM or CDMA / 16, 64, or 128 GB / Silver, Gold, Space Gray, or Rose Gold options.

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IP6S screen works then goes black randomly, phone is still going

So iPhone is fully operational, screen is working, touch is good, but randomly the screen will completely go black. Sometimes after 30 mins, sometimes with 1min of turning on.

Any ideas of what this is and how to repairs?

Thanks

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Did you try a know good LCD?

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yes, screen went black just after passcode entered

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What about the fpc connector? Also has it had water damage?

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fpc looks good, no water damage as far as I can tell

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This may be a backlight issue. The iPhone 6S does have a well documented history of this problem. When the screen goes black, does the phone appear to be working (receiving calls, text messages, recognized by iTunes)? If so, shine a bright flashlight on the screen to see if you can see a dim image.

That would indicate a backlight issue. It could be screen related or logic board related. Ideally, you would need to test it with a known-good replacement screen to eliminate a variable. Depending on your situation, you could try a screen from a different phone, or have a repair shop try out a new screen. If the screen doesn't fix it, then you will need to have it repaired by a shop that does micro-soldering repairs.

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