U2710 getting hot, no shorts

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iPhone 7

2016年9月16日に発売。モデル番号は1660, 1778で GSM かCDMA があり。/ 32、128、 256 GB / 色はローズゴールド、ゴールド、シルバー、ブラック、ジェットブラック

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Elliot @elliot1

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投稿日: 2019年3月5日

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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 さんによる2019年3月5日

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 さんによる2019年3月6日

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 さんによる2019年3月7日

Try the bb_pmic

daniel さんによる2019年3月7日

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Elliot @elliot1

評価: 127

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投稿日: 2019年3月14日

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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 評価: 159.7千 Mtwo Perform 11 191 368 · Answer 1 · 2019-03-05T03:25:48-07:00

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Ben @benjamen50

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Mtwo Perform

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368

投稿日: 2019年3月5日

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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 さんによる2019年3月6日

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iPhone 7

U2710 getting hot, no shorts

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