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My iPad 2 didn’t charged so I replaced both battery and charging connector to be sure. The iPad starts since their was a 60% charge in the new battery, but it still doesn’t charge! Is their another part that can be damaged?

You likely have a damaged charge circuit on the logic board. This can be damaged by using non-original chargers and cables (or worse, car chargers). It can also be caused by drops or just plain spontaneous failure. Normally this would require a micro-soldering repair and is not DIY. However, aftermarket batteries and small parts are notorious for poor poor quality so it is possible that you have a defective replacement charge port.

Jonathan, iPads and iPhones have an integrated chip (IC) called the Tristar chip that governs USB charging and recognition. If you have replaced both the battery and charge port and still no charging then it is possible that this Tristar chip has gone bad. That’s not uncommon since they are sensitive to voltage surges or “dirty” voltage that most often occurs when using cheaper 3rd party charging cords. Apple charging cords and certain higher quality 3rd party charging cords have components that protect against bad voltage. The Tristar chip can be replaced. It requires microsoldering equipment and expertise though.