Mackie DL806 won't charge the iPad

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Hi,

I have a Mackie iPad controlled digital mixing desk that won't charge iPad. It starts charging for a second, then stops (iPad has "not charging" on it's status bar). If I connected an iPhone to it, it charges. I found the schematics here. The SMD fuse near the iPad header is OK.
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My thought is that it's either the current sensing U61 highlighted in blue or the microcontroller (U44). I don't think it's likely to be the voltage converter (U61).

What are your thoughts? What might be wrong with this blasted thing? How to test it further?
 

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