iPhone 6S plus no power after battery replacement

Question

iPhone 6s Plus

Repair information and guides for the iPhone 6S Plus that was released on September 25, 2015. Model A1687, A1634

1041 Questions View all

Michal @michal99487

Rep: 1

2

1

Posted: Apr 1, 2019

Options

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 ?

Answered! View the answer I have this problem too

Is this a good question?

Yes No

Score 0

4 Comments

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.

Apr 1, 2019 by 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.

Apr 2, 2019 by Michal

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

Apr 2, 2019 by Minho

@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

Apr 2, 2019 by Michal

Add a comment

1 Answer

Chosen Solution

arbaman @arbaman

Rep: 102.6k

10

54

291

Posted: Apr 3, 2019

Options

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.

Was this answer helpful?

Yes No

Score 3

7 Comments:

would this answer the low main power rails voltage ?

Apr 3, 2019 by 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.

Apr 3, 2019 by 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

Apr 3, 2019 by Michal

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

Apr 3, 2019 by 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.

Apr 3, 2019 by arbaman

Show 2 more comments

Add a comment

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

1 Answer

Add your answer