iPhone X suddenly dead while repairing

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iPhone X

2017년 11월 4일 출시. A1865, A1901. GSM 또는 CDMA / 64 또는 256 GB / 은색 또는 스페이스 그레이. ("iPhone 10"으로 발음합니다.)

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Daniel M @danm270

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Repair & refurbishing of mobile devices

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게시일: 2020년 2월 14일

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iPhone X suddenly dead while repairing

Hello,

I have an iPhone X board here which mysteriously died while a repair. When connecting to a charging cable, it pulls about 0.4A (never more) but does not get hot, so all of the energy goes into the battery, port is ok as well. Windows says "there was a problem with this USB device” and except that 0.4A draw the phone is completely dead. Not reacting at all. It would be helpful if you could give me reference voltage values for troubleshooting… Could it be the Tristar?

The problem might have been caused by a poorly fitted charging dock connector. I tried with two different fully working housings (also with everything unnecessary disconnected) so it definitely is something with the logic board.

Thank you very much!

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Minho @refectio

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Getting a steady reading of 0.44A is usually a phone in DFU mode.

What problem, exactly, were you trying to repair? You may have accidentally damaged the board or a flex during your repair. The first thing to do is to do a thorough inspection of the flexes, connectors and surrounding area. Running just a bare board (I believe you tried this) can help you confirm but in your case, you will have to identify a known-good charge port.

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That's what is making this so strange.. I don't know if the X series boards are more prone to damages, because logic boards usually are made at least a bit robust and this has never happened to me before... It was working perfectly fine before I mounted it in another housing to test it. It turned out the camera unit of that housing was defective and caused the display to flicker and the phone to loop, which also happened on the other board that was mounted in there before (and that one is still working). That's all I wanted to do, nothing special. I might have been impatient, because I unfortunately connected the charging flex while a cable was connected to the phone. Full optical check under microscope was done and everything is clean and looks good (didn't see the inside though). Flexes work with another board I have here.

DFU mode seems plausible. However, phone is still not reacting at all when I use the buttons to get it out of DFU mode and phone still pulls 0.4a. Thank you.

Daniel M 의 2020년 2월 14일

The iPhone X logic board is really much more fragile than the earlier boards, due to the sandwich like construction. If the board flexed, you may have damaged the solder ball connecting the interposer to the two external layers.

Minho 의 2020년 2월 14일

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That's what is making this so strange.. I don't know if the X series boards are more prone to damages, because logic boards usually are made at least a bit robust and this has never happened to me before... It was working perfectly fine before I mounted it in another housing to test it. It turned out the camera unit of that housing was defective and caused the display to flicker and the phone to loop, which also happened on the other board that was mounted in there before (and that one is still working). That's all I wanted to do, nothing special. I might have been impatient, because I unfortunately connected the charging flex while a cable was connected to the phone. Full optical check under microscope was done and everything is clean and looks good (didn't see the inside though). Flexes work with another board I have here.

DFU mode seems plausible. However, phone is still not reacting at all when I use the buttons to get it out of DFU mode and phone still pulls 0.4a. Thank you. — Daniel M
The iPhone X logic board is really much more fragile than the earlier boards, due to the sandwich like construction. If the board flexed, you may have damaged the solder ball connecting the interposer to the two external layers. — Minho

iPhone X

iPhone X suddenly dead while repairing

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