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L'iPhone mainstream 2020 d'Apple sort le 23 octobre. Il est équipé d'un écran OLED de 6,1 pouces, d'une caméra double de 12 mégapixels et est disponible en cinq couleurs. Il succède à l'iPhone 11.

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iPhone motherboard current fluctuation

Hello! I got an iPhone 12 that does not turn on. No visible damages, no breaks, no water damage. Took it apart, connected to a dc psu, no current draw without booting. With trying to boot, it starts to draw a weird amount. It fluctuates between .400 and 0, with like 2 different spikes starting from each end, getting close to the other end, then back, and the cycle continues. Here's a vid about it:

https://youtu.be/BXc8cXyvBLs

It doesn't get hot (at least not on the upper side of the board), my sandwich heater didn't arrive it yet, and I dont want to take it apart unless it's necessary. Any ideas what could be wrong here?

Any help is appreciated!
Have a nice day!

Répondre à cette question J'ai le même problème

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any shorts around nand ?

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A short around the nand would cause symptoms like that?

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@abel11493 its possible, check for low resistance on caps

par

And what do I do, if I find more than one shorted caps? Meaning that the line is shorted, but how do I find the faulty cap, or the other source of the short? Perhaps if it doesn't generate outsanding heat, it could be under the nand, like 2 solder balls joined together?

par

@abel11493 you would need to inject voltage and either use ipa, rosin or freeze spray. failing that a thermal camera

par

There are more then one shorted lines. Mostly around the PMIC. The PP1V2_IO, PP_SRAM_S1, PP_CPU_PCORE, PP_CPU_SRAM, PP_SOC_S1, PP_AVE_S1

PP_CPU_ECORE(this one has like 0.3 ohms to ground)

PP_GPU has ~12ohms to ground.

How is this even possible?

Now when I try to boot, it the current jumps up all the way for a fraction of a second, then back to 0. When I let go of the button, it jumps up again, but then back to 0 again. If I repeat this quickly a few times, the PMIC gets really hot around H4 pads. Is the PMIC faulty? Or is it something else?

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Abel sera éternellement reconnaissant.
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