U2710 getting hot, no shorts

Question

iPhone 7

2016년 9월 16일 출시. Model 1660, 1778. GSM 또는 CDMA / 32, 128 또는 256 GB / 로즈 골드, 금색, 은색, 검정색, 칠흑색으로 제공됩니다.

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Elliot @elliot1

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게시일: 2019년 3월 5일

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U2710 getting hot, no shorts

We have a board that the U2710 gets really hot. I ordered replacement chips and swapped this power switch component.

Same situation stands, This chip really gets hot, the top half of the board doesn’t appear to heat up at all. VDD_Main draws 3.6V with a DCPS, PP1V8_SDRAM draws 0.450V. NAND lines draw nothing.

I suspect power is getting to this component but not getting through it possible?

Would really appreciate a second opinion on something a bit tricky like this. Thank you!

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Try checking the issue with pp1v8_sdram first as it's to low

daniel 의 2019년 3월 5일

Weird, after testing with DCPS, short to VDD_Main came back, was again under U2710, replaced with another and short gone, this happened one more time (10 chips arrived from aliexpress - plenty to test). Seems to get a short when DCPS is on. with a battery this draws 0.01mA. Trying to look at the schematics with ZXW to see where the power should be going.

Thank you for the help so far.

Elliot 의 2019년 3월 6일

Whenever I have this with a battery, it draws no power really, DCPS causes a constant short in the U2710, I’m thinking it could be something charhing related with a line, or chip, maybe tristar or tigris. Will update this

Elliot 의 2019년 3월 7일

Try the bb_pmic

daniel 의 2019년 3월 7일

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Elliot @elliot1

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게시일: 2019년 3월 14일

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I managed to sort this one. At first I swapped this U2710 and it made no difference, what did sort it was changing Tristar,

I also changed Tigris before Tristar but that didn’t change anything, so it was a Tristar fault I believe.

Successful case!

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Try checking the issue with pp1v8_sdram first as it's to low — daniel
Weird, after testing with DCPS, short to VDD_Main came back, was again under U2710, replaced with another and short gone, this happened one more time (10 chips arrived from aliexpress - plenty to test). Seems to get a short when DCPS is on. with a battery this draws 0.01mA. Trying to look at the schematics with ZXW to see where the power should be going.

Thank you for the help so far. — Elliot
Whenever I have this with a battery, it draws no power really, DCPS causes a constant short in the U2710, I’m thinking it could be something charhing related with a line, or chip, maybe tristar or tigris. Will update this — Elliot

Ben @benjamen50 평판: 159.7k Mtwo Perform 11 191 368 · Answer 1 · 2019-03-05T03:25:48-07:00

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Ben @benjamen50

평판: 159.7k

Mtwo Perform

11

191

368

게시일: 2019년 3월 5일

옵션

PP1V8_SDRAM draws 0.450V. Perhaps something down long that line is pulling that line down? Can be capacitors or bad resistor causing this on that same line. It’s probably a partial short which will take some time to find out which one is bad. Try removing caps on that line (Test for resistance on caps to compare resistance to ground) and see how it goes.

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Will give that line a look. Thank you

Elliot 의 2019년 3월 6일

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iPhone 7

U2710 getting hot, no shorts

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