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Released September 22, 2017. Model A1864, A1897. Available as GSM or CDMA / 64 or 256 GB / gold, silver, and space gray.

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After replacing screen I can’t get phone to turn on

So I changed the screen and put back together. I try to turn phone on by holding side button. I see a apple with grey screen go on and off every few seconds but not come on. I also tried hard reset and it didn’t work. What should I do next?

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I phone thinks the battery is dead. There is a very small resistor beside the battery connector. Easy to knock off when prying the battery connector open. Part gets lodged in the black foam. Wish I had the value of the part because that's what I did to mine.

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Anyone know where to get the BOM or value of parts on the motherboard?

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It sounds like you have a couple of problems going on. Partial or no backlight plus Boot-Looping.

This would occur if the battery wasn’t disconnected or you have dislodged some tiny components around the connectors while you were changing the screen. Have a look under magnification and see if there are any tiny components around the connectors that are loose or missing.

Also check the screen flexes for tears and make sure the battery connector is properly in place. You should also try another screen and make sure the battery is good although the battery would not affect the backlight.

Next try and boot the phone with just the LCD connector attached and see if it boots to IOS but this will depend on the IOS version you are running, if the firmware is recent it should boot.

If you have ruled out parts or you have found some dislodged components you will need to have it fixed by a repair shop as it will require microsoldering.

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Jonathan zal eeuwig dankbaar zijn.
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