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the iPad Pro i bought last year has suddenly stopped responding to all the 4 apple charging cables i own. this is weird because my old iPad Air is charging just fine with each. i was suspecting it was probably because of the gunk in the charging port but that doesn’t seem to be the case.

it might be worth mentioning that it had a complete battery drain yesterday. and after much struggle from my part it showed the ‘charging’ sign only to charge up to 1% and shut down again. it’s been totally unresponsive to all of my cables/charging devices since.

there’s critical data at stake assuming there might be something wrong with my iPad. What should i do? Please help!

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    Take it to an Apple Store for them to look at. 'Critical data' should, of course, already be backed up. – Tetsujin Aug 25 '18 at 9:49
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When troubleshooting charging issues, I would do the following (in order):

  • Always try another Lightning cable and charger, preferably Apple original or MFi certified units.(You've already tried this, go to the next step)

  • The [https://en.wikipedia.org/wiki/Lightning_(connector)|Lightning cable 8-pin connector] should be sitting flush with the housing and completely inserted. If it is not, there could be lint/dust/debris inside the port impeding a proper connection. You can clean it out with fine point tweezers or a dental pick. Just be careful not to damage the pins inside the Lightning Port.

  • Change the battery. The battery is the weakest link in the entire device and certainly for charger related issues. Unfortunately, it's a not a trivial repair on an iPad. If you can get the device to boot, the use a battery utility, such as coconutBattery (for Mac) or 3uTools (for Windows) to test the battery prior to removal. Anything less than 70% of design capacity will require replacement.

  • If the battery is in good condition, you can use a USB Ammeter to determine if the phone is really drawing current when it says it's charging. If it isn't drawing current, then I would change the Lightning/Charge Port. This is also a non-trivial repair as it requires some micro-soldering.

If a new battery and charge port still don't resolve the issue, then you either have faulty replacement parts (possible) or a logic board issue.

If you are up to the challenge of opening your iPad, then there is an IC (commonly referred to as Tristar) responsible for communicating with the charging device and uncertified chargers can damage it. Unplug the battery and connect a known-good (preferably Apple original or MFi) charger to the device. A properly working device will show an Apple logo and boot loop. If the Tristar IC is bad then the device will not do anything.

Because you have critical data, you can't just bring this to the Apple store because they will only offer you a replacement device. If you need to save this data, then follow the steps outlined above or find an independent repair shop to do some tests. If the problem is at the logic board level, then a shop that does micro-soldering repairs may be able to save your device or your data.

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