iPhone 6 water damage -Bootloop -PMIC Hot

Question

iPhone 6

Introdotto il 19 settembre 2014, questo iPhone con schermo da 4,7" è la versione più piccola dell'iPhone 6 Plus. Identificato dai numeri modello A1549, A1586, and A1589.

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Niklas Jakob @niklasjakob

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Postato: 5 apr 2018

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iPhone 6 water damage -Bootloop -PMIC Hot

Hello,

i ve got a Iphone 6 I bought it with the discription it is failing to restore . So i tried my luck with FoneLab. As soon as you plug the cable in it goes in recovery mode, so i restored it. After restoring it was caught in a bootloop (black... apple logo... black ...applelogo).

So i took a look at the inside (probably a little late). And there it is waterdamage indicators red.

First of all i took the pcb out and had a look than i removed the shields and cleaned it with a ultrasonic cleaner (a cheap one) and alcohol.

Tried it again to restore it. Looks better. goes into the install home screen. The thing is the touchscreen works but the home, power and volume button doesnt work.

I tried a other screen assemply same thing.

thna i noticed the PMIC is getting incredible hot.

I messured for shorts on the main power lines - All good

I messured the voltages of those

- PP5V0_USB 4,9V

- PP_BATT_VCC 4,09V

- PP_VCC_MAIN 3,79V (when i unplug the akku its up to 4,25V, but the akku should be good)

I messured all voltages from the PMIC and its missing PP_GPU, PP3V0_ACC and PP_VAR_SOC is just 0,84V(should be 1v?).

The software works fine now. So i need some help with the hardware? Thanks

Tried another lightning connector still the same

But i found this filter FL2024 its almost broken of the board but still has his connections. i will change this one but do you think thats the problem?

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Tried another lightning connector still the same

But i found this filter FL2024 its almost broken of the board but still has his connections. i will change this one but do you think thats the problem?

[image|1396044]

5 apr 2018 da Niklas Jakob

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Soluzione Prescelta

Minho @refectio

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Postato: 5 apr 2018

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If the PMIC is getting super hot and there are no apparent shorts on the output (you did say you tested them all, right?), then consider running the device in bare-board mode. Remove the logic board, connect a known-good Lightning port flex and battery (preferably different ones) and then boot the board by connecting an iTunes enabled computer. Check to see if it is getting hot and see how long the battery lasts. Then put the logic board back in the housing and start adding peripherals (Lightning, cameras, sensors, button flexes etc) one at a time and verify.

There's a good possibility that one of the peripherals is dragging the system down.

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thanks i will try a another lightning port flex. i was already running it in bare-board. I think i was still using the old lightning port. i will give it a try.

5 apr 2018 da Niklas Jakob

FL2024 is on the BL Anode line. So that would affect the backlight but not the boot looping.

5 apr 2018 da Minho

could it be the pmic itself? Dont really want to change it

5 apr 2018 da Niklas Jakob

Yep, always possible. That's why you want to probe the outputs first so you don't change it for nothing. But a bad PMIC can be hard to distinguish from bad downstream IC's. At some point, you have to start removing stuff to get a proper sense of what's wrong.

5 apr 2018 da Minho

the phone is booting but the pmic is getting hot and neither home nor power button is working. so i cant get pass the installation screen. what could be a reason for a not working home button. ( i allready changed the display / homebutton assembly for a known good)

10 apr 2018 da Niklas Jakob

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Tried another lightning connector still the same

But i found this filter FL2024 its almost broken of the board but still has his connections. i will change this one but do you think thats the problem?

[image|1396044] — Niklas Jakob
thanks i will try a another lightning port flex. i was already running it in bare-board. I think i was still using the old lightning port. i will give it a try. — Niklas Jakob
FL2024 is on the BL Anode line. So that would affect the backlight but not the boot looping. — Minho
Yep, always possible. That's why you want to probe the outputs first so you don't change it for nothing. But a bad PMIC can be hard to distinguish from bad downstream IC's. At some point, you have to start removing stuff to get a proper sense of what's wrong. — Minho
the phone is booting but the pmic is getting hot and neither home nor power button is working. so i cant get pass the installation screen. what could be a reason for a not working home button. ( i allready changed the display / homebutton assembly for a known good) — Niklas Jakob