Do this first, peel the black tape back on the bottom of the battery and check voltage of the battery. You'll need to be around at least 3 volts DC to get the iPad to do anything. You can also check the battery connector plug on the motherboard terminals to see if your getting any current with the charger like this. I had a similar issue and it was the charging port. I checked the battery and it was around 2.7 volts DC (too low), and the battery terminals were not getting and charge, so I knew it was in that circuit. Hope that helps.
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