Aggiusta la tua roba Comunità Store

L'iPhone da battaglia per il 2020 di Apple è stato rilasciato il 23 ottobre; ha schermo OLED da 6,1", sistema di fotocamere doppio da 12 MP ed è disponibile in cinque colori. È il successore dell'iPhone 11.

165 Domande Visualizza tutte

Opzioni

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!

Rispondi a questa domanda Anch'io ho questo problema

Questa è una buona domanda?

Sì No
Punteggio 0
Aggiungi un commento

1 Risposta

Filtra per:
Più utili Più recenti Più Vecchio
Risposta Più Utile

Opzioni

any shorts around nand ?

Questa risposta è stata utile?

Sì No
Punteggio 2

9 Commenti:

A short around the nand would cause symptoms like that?

da

@abel11493 its possible, check for low resistance on caps

da

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?

da

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

da

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?

da

Mostra altri 4 commenti

Aggiungi un commento

Aggiungi la tua risposta

Abel sarà eternamente grato.
Visualizza Statistiche:

Ultime 24 Ore: 0

Ultimi 7 Giorni: 0

Ultimi 30 Giorni: 3

Tutti i Tempi: 51