Device wont actively track Battery %

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iPad Mini

iPad Miniは7.9 インチのディスプレイで、容量は16、32、64 GBがあります。

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Scott @scott35006

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投稿日: 2017年2月21日

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Device wont actively track Battery %

hey team! ive encountered an issue.

Theres an iPad im trying to fix that has an issue with actively readying the battery.

if the battery is at say 54% hypothetically when i turn the device on, it will not read another battery level, but if i turn the device off, then on again, it will read a new battery level.

I tried 2 new charge ports, and a new battery.

I would prefer to keep the data if at all possible, though i am aware there is potential that it could be software reload time. this is my last resort, and would like to try other things (boardwork) first.

Please answer if you have seen this issue before.

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Scott , Just a thought, could you just not install a free battery app something like one below.

https://itunes.apple.com/us/app/battery-...

L Pfaff さんによる2017年2月21日

3UTools if you want to check battery information via computer.

Ben さんによる2017年2月21日

i would like to learn how to fix it. thanks though.

Scott さんによる2017年2月23日

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Minho @refectio

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Hi Scott. Do you know if the battery you used to test is "known-good"?

Have you checked FL7500, right next to the battery connector? It is the only thing inline between the battery gas gauge and it's ultimate destination, the PMIC and the CPU. Normally a bad or missing FL7500 causes erratic readings but that would certainly be the right thing to check in your case.

Verify it's presence, good electrical connection and measure its resistance. At DC levels, it should read essentially zero. It only becomes resistive at high frequency to filter out noise.

Otherwise, you should do a full restore to eliminate any software issues.

UPDATE

Hopefully for you, the missing pad is the one in the red square. You can easily jump it to the cap right next to it or the connector pin. If it is the blue circle, well then you will have to very delicately scrape the board to get some of the copper via because it connects directly to the CPU and PMIC.

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if you could post an image of the board, and highlight its location, so i can do as suggested, or a schematic for me to read, i would appreciate it.

Scott さんによる2017年2月23日

The schematic is widely available on the web. You may need to sign up to GSM-Forum. This is a very tiny component...do you have the right tools to do this?

Minho さんによる2017年2月23日

i do board work on Samsungs regularily, im assuming it will be similar to that.

Scott さんによる2017年2月23日

Yeah, then no worries. It's a 0201 SMD component.

Minho さんによる2017年2月23日

component is not present. one of the traces are missing. do you know where i could jump the lead to?

Scott さんによる2017年2月23日

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Scott , Just a thought, could you just not install a free battery app something like one below.

https://itunes.apple.com/us/app/battery-... — L Pfaff
3UTools if you want to check battery information via computer. — Ben
if you could post an image of the board, and highlight its location, so i can do as suggested, or a schematic for me to read, i would appreciate it. — Scott
The schematic is widely available on the web. You may need to sign up to GSM-Forum. This is a very tiny component...do you have the right tools to do this? — Minho
i do board work on Samsungs regularily, im assuming it will be similar to that. — Scott
component is not present. one of the traces are missing. do you know where i could jump the lead to? — Scott

iPad Mini

Device wont actively track Battery %

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