short on 5v7 line

Question

iPhone SE

4-дюймовый iPhone выпущенный в марте 2016 года на той же самой платформе, что и 6s. Доступен в серебристом, сером, золотом и розовом цветах с 16/64 Гб памяти. Модели A1662 и A1723.

1049вопросов Показать все

daniel @tech_ni

Репутация: 34,6к

10

22

44

Опубликовано: 11 апр 2018 г.

Опции

short on 5v7 line

@refectio i bought a liquid damaged se the other day and recieved it this morning. on dc its drawing over half an amp which i would think would be enough to show the apple logo. testing for shorts i found that PP5V7_SAGE_AVDDH is short to ground, i removed c4323 and c4005 as they are the areas that looked a bit damaged. so having no image don't even think i have backlight but havent checked that im guessing that chestnut could be the culprit but i dont really want to remove it unless i need to. would you say chestnut or something else

update: removed chestnut and the short is gone

does your se schematics work on blackfish as i get an error with them

Отвечено! Посмотреть ответ У меня та же проблема

Это хороший вопрос?

Да Нет

Оценка 1

1 Комментарий

so i reballed chestnut and now getting even less power at max 0.08 amps. removed chestnut again and still the same, on pp_gpu c1100, c2018 and c2017 will draw full amps (2) from dc but the rest of the caps draw less. any ideas @refectio pp_gpu was the only line shorting to ground aswell after chestnut was sorted removed said caps and a coil still short

11 апр 2018 г. из daniel

Добавить комментарий

1 ответ

Выбранное решение

Minho @refectio

Репутация: 221,4к

15

289

807

Опубликовано: 11 апр 2018 г.

Опции

Are you certain PP_GPU is shorted...it is a vey low resistance line so if you don't look at the measurement, you can be fooled by the continuity test. If you have a true short (0 Ohms), then it could either be the PMIC or the CPU, assuming none of the caps on the line are causing the short. I have seen several shorted CPU's recently on water damaged devices. In the end, I removed the CPU and measured it directly on chip to confirm.

EDIT

The voltages should all be on the PMIC page. Picture below is iPhone 6S.

Был ли этот ответ полезен?

Да Нет

Оценка 2

18 Комментариев:

think i measured but cant remember exact readings, so why would the 3 caps on the line take a full 2 amps on the actually pp_gpu side. iv since taken of cpu and pmic, not lookin great around pmic tho tweezers took a slip and components everywhere. i ordered a used board on ebay that i dont know much about until it arrives, it says could be liquid damaged but indicators are still white, could be icloud lock but will see in a few days

11 апр 2018 г. из daniel

@refectio got the se board in today along with a 6s, the se is booting but no touch. i can see the 6s booting with dc but when i put on the lcd and or dock connector it wont go past 0.43 amps yet it will go above 1 amp without them

12 апр 2018 г. из daniel

Probably PMIC issues but you will have to probe them a bit to understand what works and what doesn't.

12 апр 2018 г. из Minho

does schematics not show what the voltages are supposed to be as i cant see them

12 апр 2018 г. из daniel

I can see them fine in the SE schematic I have.

12 апр 2018 г. из Minho

Показать 13 больше комментариев

Добавить комментарий

so i reballed chestnut and now getting even less power at max 0.08 amps. removed chestnut again and still the same, on pp_gpu c1100, c2018 and c2017 will draw full amps (2) from dc but the rest of the caps draw less. any ideas @refectio pp_gpu was the only line shorting to ground aswell after chestnut was sorted removed said caps and a coil still short — daniel
think i measured but cant remember exact readings, so why would the 3 caps on the line take a full 2 amps on the actually pp_gpu side. iv since taken of cpu and pmic, not lookin great around pmic tho tweezers took a slip and components everywhere. i ordered a used board on ebay that i dont know much about until it arrives, it says could be liquid damaged but indicators are still white, could be icloud lock but will see in a few days — daniel
@refectio got the se board in today along with a 6s, the se is booting but no touch. i can see the 6s booting with dc but when i put on the lcd and or dock connector it wont go past 0.43 amps yet it will go above 1 amp without them — daniel
Probably PMIC issues but you will have to probe them a bit to understand what works and what doesn't. — Minho
does schematics not show what the voltages are supposed to be as i cant see them — daniel

iPhone SE

short on 5v7 line

1 ответ

Добавьте свой ответ