I would guess this is damage inside some chip from the original drop if this problem continues after restore.
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Wait---I bet I know what this one is.
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Wait---I bet I know what this one is.
It is the common pry damage at the battery connector---check for something like this pic. If you've accidentally flicked off components with fingernails/tools by prying up the battery connector on the board side instead of the battery side, then the iPad has lost its 'gas gauge' function of the battery. i.e. it reports the wrong battery charge percent, and it doesn't 'know' when the battery is dead---it will continue to try and boot off a dead battery instead of engage the low battery logic. It looks like the problem you describe. putting it on the charger overnight will alleviate the problem, because the battery can actually charge....but once the battery runs down (even though it says it is still charged) the apparent boot loop problem begins again.
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Replace the components and it will solve.
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If your customer is in the habit of putting the ipad on the charger regularly, she won't see the boot loop problem because it won't get too low.
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Replace the missing components at the battery area and it will solve.
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I am posting a picture of this damage---let me know if yours looks like this.
I would guess this is damage inside some chip from the original drop if this problem continues after restore.
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Wait---I bet I know what this one is.
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It is the common pry damage at the battery connector---check for something like this pic. If you've accidentally flicked off components with fingernails/tools by prying up the battery connector on the board side instead of the battery side, then the iPad has lost its 'gas gauge' function of the battery. i.e. it reports the wrong battery charge percent, and it doesn't 'know' when the battery is dead---it will continue to try and boot off a dead battery instead of engage the low battery logic. It looks like the problem you describe. putting it on the charger overnight will alleviate the problem, because the battery can actually charge....but once the battery runs down (even though it says it is still charged) the apparent boot loop problem begins again.
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Replace the components and it will solve.
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I am posting a picture of this damage---let me know if yours looks like this.