iPhone XS Max not turning on

Question

iPhone XS Max

Выпущено 21 сентября 2018 г. Модели A1921, A2101, A2102, A2104. Доступен как GSM, CDMA / eSIM или nano-SIM / 64, 256 или 512 ГБ / серебристый, золотой или космический серый. (Произносится как «iPhone 10 S Max.»)

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Myron. @iammyron07

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Опубликовано: 11 ноя 2020 г.

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iPhone XS Max not turning on

I received an iPhone XS Max which was reported dead and was previously worked on a by a repair store. When I opened the phone I saw 1 missing cap which I guess was pryed off by the old store.

Then Proceeded to separate the board and I find that the top layer is shorted from the CPU running through the PMIC and currently I am clueless.

Any help would be greatly appreciated!

Cheers.

Just noted that the U3100 ic and the U5900 ic has been removed and the caps C2721 and C2725 is also removed near the NAND.

Also, C2991 has been removed below the NAND which I suppose is a cap for VDD_MAIN (correct me if i am wrong).

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bert.harmidomski @tojaert Репутация: 4,8к 11 5 1 · Answer 1 · 2020-11-12T04:06:31-07:00

bert.harmidomski @tojaert

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Опубликовано: 12 ноя 2020 г.

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Hello Myron,

it’s always happens. People buy a phone on ebay, put their screwdrivers in there, their dirty fingers, twist and drill and then sell it as "i look in the morning and it turned off and never turned on again". It is sad that you have come across a dishonest seller. I will try to help, but first question: do you have experience in microelectronics repair?

Firstly, you have to check nad measure main power rail, which is PP_VDD_Main.

Secondly, top layer is independent in this model, so you can power it, if you've made a clear with detached capacitors before - ( c2721 is on SOC_S1 line, that is a PMU buck line - important one - measure here too ).

Finally, plug DCPS, screen panel and prompt to boot by tweezers. Pay attention to what is happening with the power consumption and on the screen. If it's ok, go to the bottom (radio) part of the sandwich.

I hope I helped. As if what, write or email me.