Just replaced the glass,charger port,volume/power cable,antenna and Battery pack.For some reason,which I hope and get educated as to why,Ipad powers up with the charger ,but NOTHING from battery ,when cord is disconnected.In addition,I cannot get power from the USB ,therefore ,ITUNES does NOT recognize the IPAD.I have taken the Ipad apart ,checked,rechecked ,connections,tested battery ,and it has power.I'm positve the connectors to motherboard and battery are making contact.Can't imagine anything else,EXCEPT ,a bad motheboard??? Hoever ,I'm far from an electronics wizard,so,please,someone enlighten me. Thanks. Mikesea