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iPhone con schermo da 4" introdotto nel marzo 2016 con specifiche hardware simili a quelle dell'6s. Disponibile in Argento, Oro, Grigio siderale, Oro rosa con 16 o 64 GB. Modelli A1662 e A1723.

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iPhone SE Random powering off and possible shorting?

So I recently transferred the hardware of a scuffed up but fully functional 16GB Rose Gold iPhone SE into a new Silver shell an also installed a new screen and battery. The expectation was that after this refurb the phone would function like new, but sadly not. This phone was fully functional before the shell transfer so this one’s on me. :(

Upon testing the phone after the repair, I often encountered an issue where the phone would suddenly shut off 3-5 minutes from booting up. This is probably a kernel panic and that a quick backup and restore should fix the issue but after attempting this 4 or so times the issue persists.

Not only that, after switching off and attempting to reboot, the phone struggles to get past the Apple logo, which will stick there for a considerable amount of time considering it’s fresh iOS boot. However, the phone rarely gets past the boot sequence after this, and instead switches off repeatedly. When the screen shuts off it doesn’t shut off in the normal fashion, but in a strange blotchy effect that looks well… unhealthy.

https://www.youtube.com/watch?v=e-81GECX... (Video of the issue)

During troubleshooting I noticed that my replacement battery cable that connects to the logic board had been scuffed up a bit and the copper coating was showing. This cable was pressing slightly against the logic board and the shell and I thought that that was the issue and there was a shorting issue. However, upon covering up that scuff with some electrical tape and also the shell where the cable was touching the issue still persists.

If anyone has any advice, fixes or ideas about what the issue may be please respond asap and run me through what to do if possible. I’ve repaired several iPhones but this is my first shell transfer and all other things work well as far as I can tell.

Thanks,

Will

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I agree, that shutdown doesn’t look healthy :>).

Considering you did a housing swap, it could be just about anything. You know for certain it worked fine before so let’s build from there. Was the replacement housing completely empty (no flexes) or was it already partially built up requiring only a logic board swap? Was the replacement housing an original housing or an aftermarket?

Here’s the reasoning behind the questions. Cheap aftermarket housings are known to have higher defect rates. Even an original housing can have defective flexes (they’re available for a reason, something was wrong with the phone) so you are dealing with unknowns.

Unless you know for certain that the replacement housing and whatever was left inside it was 100% functional, ideally you will want to transfer over all of the known good stuff from your original housing. However, that also comes with risk as even a small tear in a flex can cause issues.

Think about the points I raised and use that to help guide your troubleshooting. I would start with a full inspection of the flexes and housing. If the original housing is still available with the flexes untouched, I would install the logic board there to see if you can get back to a working state. You need to eliminate as many variables as possible and work with whatever known-good parts you can identify. The phone will boot with nothing more than a battery and Lightning port connected to the board (just plug it to an iTunes enabled computer). Then add stuff bit by bit. Add the screen (with no FCAM connected), then add cameras, buttons sensors etc.

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This is a completely empty aftermarket housing off of eBay, no hardware aside from the buttons/mute switch. The original housing is no longer available but I do know that all parts were transferred over as I checked repeatedly before throwing it away to make sure of that.

And it's not perfect, the build quality does not quite match the iPhone and the Apple logo on the back even sticks out a bit (it is inserted properly into the shell too). However everything fit well and there weren't any issues with screws not quite matching up with holes or janky mounting methods.

Seeing as it's an empty housing I did in fact have to peel away all of the ribbon cables and re-seat them in the new shell as well as put in all of the small rubber grommets and stuff.

Is it not likely then that it's just the battery that is the issue? It's a relatively cheap one off of eBay and not a higher quality one like an iFixit replacement. If not might it be worth buying a newer higher quality one just in case and testing that?

Thanks

da

I also tested this phone with another iPhone 5s screen I had laying around and the issue persisted. So the screen being an issue seems out of the question.

da

IMO, the screen wouldn't sut down that way due to a bad battery...but you never know. What was wrong with the original battery? If it is still available, I would try it first. Check the flexes for tears. If not, then check the logic board for damage near the connectors. Unfortunately, at some point, the only way to troubleshoot is to build up slowly with known-good parts.

da

The original battery had been extensively used for many years so it was time for a new one anyways, and yeah that's been thrown out too sadly. I can check the logic board next to the battery connectors and see if there's any obvious damage or other issues. I can also try strip down the phone to it's bare essentials and see if the problem persists.

It doesn't help that my girlfriend recently dropped her iPhone 6 (the phone the SE was meant to replace) into the toilet so now I have time pressure too. I'm going to get her a cheap nokia for the time being until I can figure out the issue with the SE.

Thanks again

da

Okay so I have the phone open and also plugged in at the moment and I'm not experiencing any of that strange boot looping and screen powering off stuff, I am however still experiencing the kernel panics which at the moment are happening every 5 or so minutes. After these panics the phone reboots quickly back into iOS no problem. It's rebooted several times now from the kernel panics and not once had the issue. Is it possible that it's something to do with the screen being closed shut against the phone that's causing the bootup issues? Because it's being held open and there aren't any of those funky booting issues I was having before, just the kernel panics.

Sidenote; also after each bootup the battery charging chime plays but even after a few minutes the lock screen says charging 0%, and the battery meter is empty too, however after unplugging the charger and then re connecting it it then displays that it's charging and at the right percentage this time. Also if I have the phone plugged in and then I power it off manually, it doesn't show that it's charging. And after booting up and reconnecting the charging cable the percentage is the same as what it was before, and the battery hadn't been charged at all.

da

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Will sarà eternamente grato.
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