iPhone 6S plus no power after battery replacement

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iPhone 6s Plus

iPhone 6s Plus 发布于2015年9月25日,有两个型号A1687、A1634，网络制式有GSM、WCDMA，存储容量有16GB、64GB、128GB可选，机身颜色有银色、金色、深空灰、玫瑰金。维修iPhone 6s Plus和前代产品相似，需要螺丝刀和撬棒等。

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Michal @michal99487

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发帖于: 2019年4月1日

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iPhone 6S plus no power after battery replacement

Hi, I changed battery on my iphone 6S plus and after this the phone can´t boot. When I plug DCPS to the phone it hangs on 0.20 mah. I have tried replacing Tristar but this didn´t fix the issue. Any ideas ?

thanks

Edit: This phone was bought “for spare parts”, because it didn´t turn on. Previous owner changed the battery because he had to charge phone twice a day. He didn´t remove display so there is no long screw damage. After replacing tristar the draw after prompting to boot is everywhere from 0,05 to 0.40 mah. There are no power rails from PMIC present apart from pp1v8_always.

It is recognised by iTunes.

I´m still learning so that´s why I buy broken phones trying to fix them. This one is headache.

Measurements taken from board ( no display/body ) around PMIC and main rails:

WHAT / WHERE / VOLTS / DIODE

PP_BATT_VCC / TP02 / 1,22 / 1287

PP_VCC_MAIN / C2120 / 1,23 / 1286

PP5V0_USB / C2310 / 0 / OL

PP_CPU / C2000 / 0 / 025

PP_GPU / C2011 / 0 / 025

PP_SOC / C2022 / 0 / 021

PP_FIXED / C0750 / 0 / 067

PP1V8_SDRAM / C2132 / 0 / 252

PP1V1_SDRAM / C2130 / 0 / 225

PP_CPU_SRAM / C2070 / 0 / 076

PP_GPU_SRAM / C2080 / 0 / 183

PP1V1 / C1243 / 0 / 247

Does low Volts on the main power rails means there is a short on the smaller rails ?

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You have too many variables going on in this phone in order to troubleshoot. When was the phone last working? What made you think it needed a new battery? What happened to the phone? What is the physical exam? Present a case like a physician.

由 jessabethany 完成的 2019年4月1日

@jessabethany Edit: This phone was bought “for spare parts”, because it didn´t turn on. Previous owner changed the battery because he had to charge phone twice a day. He didn´t remove display so there is no long screw damage. After replacing tristar the draw after prompting to boot is everywhere from 0,05 to 0.40 mah. There are no power rails from PMIC present apart from pp1v8_always.

There is no physical damage to the board or phone itself.

I´m still learning so that´s why I buy broken phones trying to fix them. This one is headache.

由 Michal 完成的 2019年4月2日

Did you check if the phone is in DFU mode ..?

由 Minho 完成的 2019年4月2日

@refectio I´ve connected this to itunes. Tried to update, got error 14, changed USB port, applied restore and update. Now it´s all set up but still, no image at all. this is weird

由 Michal 完成的 2019年4月2日

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arbaman @arbaman

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If we put together the no image at all with the original owner not having removed display when replacing battery, on a 6S we get a pretty high chance that the backlight circuit is the problem you’re facing right now. Try to shine a torch in a darker environment at boot, if you can see a very dimmed image the backlight issue would be confirmed. It might be involved a filter if you’re lucky or any other backlight circuit component in the worst scenario.

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would this answer the low main power rails voltage ?

由 Michal 完成的 2019年4月3日

I would double check the readings you posted, as with a PP_VCC_MAIN of 1.23V phone wouldn't boot or restore at all.

由 arbaman 完成的 2019年4月3日

I don´t know really what happened here. I would swear to god I had around 4V in vcc main. restored, tried booting with cable/button, tried resseting, DFU, nothing has helped and now it reads 1.23v

由 Michal 完成的 2019年4月3日

@arbaman 3.9 again now after quick check, I´m lost ....

由 Michal 完成的 2019年4月3日

Unless there's a short taking down Vcc_Main, which supplies power to the backlight circuitry too, a bad backlight would not explain those low readings. I can't really figure out why you have such up and down readings but.. when the phone boots check if you have a dimmed image, you didn't mention if you checked it. Or try looking for shorts when you have low readings.

由 arbaman 完成的 2019年4月3日

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You have too many variables going on in this phone in order to troubleshoot. When was the phone last working? What made you think it needed a new battery? What happened to the phone? What is the physical exam? Present a case like a physician. — jessabethany
@jessabethany Edit: This phone was bought “for spare parts”, because it didn´t turn on. Previous owner changed the battery because he had to charge phone twice a day. He didn´t remove display so there is no long screw damage. After replacing tristar the draw after prompting to boot is everywhere from 0,05 to 0.40 mah. There are no power rails from PMIC present apart from pp1v8_always.

There is no physical damage to the board or phone itself.

I´m still learning so that´s why I buy broken phones trying to fix them. This one is headache. — Michal
@refectio I´ve connected this to itunes. Tried to update, got error 14, changed USB port, applied restore and update. Now it´s all set up but still, no image at all. this is weird — Michal
I would double check the readings you posted, as with a PP_VCC_MAIN of 1.23V phone wouldn't boot or restore at all. — arbaman
I don´t know really what happened here. I would swear to god I had around 4V in vcc main. restored, tried booting with cable/button, tried resseting, DFU, nothing has helped and now it reads 1.23v — Michal
Unless there's a short taking down Vcc_Main, which supplies power to the backlight circuitry too, a bad backlight would not explain those low readings. I can't really figure out why you have such up and down readings but.. when the phone boots check if you have a dimmed image, you didn't mention if you checked it. Or try looking for shorts when you have low readings. — arbaman

iPhone 6s Plus

iPhone 6S plus no power after battery replacement

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