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The ipad turns on after i replaced the logic board but when i go to plug in the charger it will not charge. Help would be great please.

Not so many things I would point you to..double check charger, charging cable and then charging port and the connecting flat cable to the logic board and relevant connector..It might be just a small thing, little bad luck. If all those parts work properly, there’s only the logic board left with its charging IC…are you 100% sure it was working perfectly before install ?