Short on LogicBoard - Please help identify the circuit

Question

iPhone SE 2020

2020년 4월에 발표 및 출시된 2세대 iPhone SE의 수리 및 분해 정보입니다.

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Adrian @papaulm

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adrian büsselmann

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게시됨: 2021년 10월 24일

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Short on LogicBoard - Please help identify the circuit

I got this iPhone SE 2020 from a friend of mine for Data-Recovery after a liquid damage. First I got a short in the Power IC Chip at the center of the picture (APL1092). After changing this one, there seems to be another short on the board. This time I don’t know where to inject voltage, can someone help me with this line? (I marked the Diode-Mode-Shorting out Caps in the picture.)

The picture

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inject into the battery connector first and see what current it draws.

daniel 의 2021년 10월 24일

@tech_ni Unfortunately there is nothing going into the board from battery oder the lightning connector.

Adrian 의 2021년 10월 24일

i have wxj software but unfortunately it doesnt show line names for the se2. it could be low resistance lines that seem short but actually are fine. have you any photos of the actual board you could post.

daniel 의 2021년 10월 24일

@tech_ni no low resistance, I've got 0,2 ohms ...

Adrian 의 2021년 10월 24일

Here is a picture from the actual board. I‘ve tried to input voltage but its getting right to ground. Nothing on the board seems to get hot. It drops from 1V to 0,8V with 2Amps, should I give it more? I think it might be a layer-short or sonething like that … [image|2503942]

Adrian 의 2021년 10월 24일

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Chris Stables @imicrosoldering

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I don’t want to be the bearer of bad news but these lines are the PP1V8_IO, PP_CPU_PCORE and PP_DCS_S1 circuits. I am not sure about the last two diode readings but the PP1V8_IQ should be around 0.24. I think you will find the short is under the CPU. This is common if too much heat is applied to the PMIC.

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Oh crap, so it was me that forced this to happen by getting out the chip on the other side of the CPU? Is there anything I can do now besides from reballing the CPU? (Which I don‘t consider?)

Thank you so much for your help @imicrosoldering! How did you find out about these lines? Are you the only person with the boardview?

Adrian 의 2021년 10월 24일

@papaulm The only thing you could do is remove all the components on the 1V8 IQ line. The other two circuits I am not sure of their resistance but I would think they would be extremely low so you would need to compare in OHM, s mode against a known good board.

The ZXW software shows all the components and circuits just not the diode values. I think everyone is looking in the wrong place lol. I have put a pic above.

Chris Stables 의 2021년 10월 24일

@imicrosoldering You are very helpful, this is only extended hobby for me, not for living ;-) So I didn‘t get myself the ZXW Software due to financial reasons. Therefor I really appreciate your help!

All lines are at 0,2Ohms which tells me that you were right from the beginning with your suggestion about the shorted CPU.

Do you eventually know which chips I have to transfer to get the data out? Is there some binding in the CPU itself?

Adrian 의 2021년 10월 24일

@papaulm You will need to transfer the NAND, CPU and the logic EEPROM (U1401). You might have to do an update which should pass without transferring the baseband CPU and its EEPROM otherwise you will need to transfer those as well.

Chris Stables 의 2021년 10월 25일

@imicrosoldering Thank you so much! I will try to remove the CPU first of all to see if the short is gone. Then I can go from there. Its ok for my friend that I „practice“ on his board to see if I can eventually recover the data. Thank you so much Chris for reaching out to me and answering all my questions! Really appreciate your knowlege!

Adrian 의 2021년 10월 25일

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댓글 달기

inject into the battery connector first and see what current it draws. — daniel
@tech_ni Unfortunately there is nothing going into the board from battery oder the lightning connector. — Adrian
i have wxj software but unfortunately it doesnt show line names for the se2. it could be low resistance lines that seem short but actually are fine. have you any photos of the actual board you could post. — daniel
Here is a picture from the actual board. I‘ve tried to input voltage but its getting right to ground. Nothing on the board seems to get hot. It drops from 1V to 0,8V with 2Amps, should I give it more? I think it might be a layer-short or sonething like that … [image|2503942] — Adrian
Oh crap, so it was me that forced this to happen by getting out the chip on the other side of the CPU? Is there anything I can do now besides from reballing the CPU? (Which I don‘t consider?)

Thank you so much for your help @imicrosoldering! How did you find out about these lines? Are you the only person with the boardview? — Adrian
@papaulm The only thing you could do is remove all the components on the 1V8 IQ line. The other two circuits I am not sure of their resistance but I would think they would be extremely low so you would need to compare in OHM, s mode against a known good board.

The ZXW software shows all the components and circuits just not the diode values. I think everyone is looking in the wrong place lol. I have put a pic above. — Chris Stables
@imicrosoldering You are very helpful, this is only extended hobby for me, not for living ;-) So I didn‘t get myself the ZXW Software due to financial reasons. Therefor I really appreciate your help!

All lines are at 0,2Ohms which tells me that you were right from the beginning with your suggestion about the shorted CPU.

Do you eventually know which chips I have to transfer to get the data out? Is there some binding in the CPU itself? — Adrian
@papaulm You will need to transfer the NAND, CPU and the logic EEPROM (U1401). You might have to do an update which should pass without transferring the baseband CPU and its EEPROM otherwise you will need to transfer those as well. — Chris Stables
@imicrosoldering Thank you so much! I will try to remove the CPU first of all to see if the short is gone. Then I can go from there. Its ok for my friend that I „practice“ on his board to see if I can eventually recover the data. Thank you so much Chris for reaching out to me and answering all my questions! Really appreciate your knowlege! — Adrian

iPhone SE 2020

Short on LogicBoard - Please help identify the circuit

Update (24.10.2021)

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