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苹果 iPhone 5s 于2013年9月10日公布。该设备的维修与以前的型号相似,需要螺丝刀和撬棒。可使用GSM或CDMA / 16、32或64 GB。颜色有银色、金色和太空灰。

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Blue Screen / Bootloop / Black Screen "Not" U6 Long Srew Related

Hi Guys,

Hope you can help..

Shortly before Christmas I was tasked with refurbishing an iPhone 5s for a client. On pre-testing the phone (which already had a damaged LCD) I noticed it wouldn't charge, in fact my first charging cable used burnt out. I ended up changing the charging port assembly and battery, at which point the phone began to charge.. The next problem happened when I came to boot the phone, the Apple logo appears, the screen dims as its supposed to.. then a blue screen would flash and then just a black/blank screen. however, I spent a lot of time going through DFU and trying various suggestions from forums, I also removed the U6 screw holder to inspect for damage beneath, There is no visible damage to the circuit board, so I re-soldered it back in place, and after lots of fiddling & messing about the phone started to work and I continued with the refurbishment.. Two weeks later and the phone has fallen over, it will boot intermittently but 9x out 10 you will only get the blue flash and followed by a black screen..

Are you aware of any particular components like the U2 IC chip or other that may be causing this issue, has anyone successfully rectified this issue.. also, some links to some schematic diagrams of the iPhone 5s logic board would also be very helpful..

Many Thanks in advance..

Paul

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Hi Paul,

Have you tried booting the phone without the camera/proxy/speaker flex in place/attached?

I have seen the blue screen of death caused by a faulty camera/proxy/speaker flex before. Simply remove from connector and boot with the LCD and touch flex in place.

I expect you've tried it but hopefully a simple answer. The burnt out charger is worrying though.

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Hi James, thanks for responding.. I have also seen the issue you described and for anyone reading this with a similar issue, it would certainly be worth trying, however in this case it's not the cause.. I am going to replace the main power ic and the U2 IC chips as a shot in the dark, I've replaced the clients logic board, so I've nothing to loose except money, but training is priceless :)

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