wont charge even when connected to charger

I have a blackbery 9720 and wont charge even when its connected. The charging sign doesn't show, my sister has the same phone a and we switch to see if it would work and it charged in her phone and mine didn't. What should I do?

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Did you try your sisters battery in your phone to see if it will charge her battery? Or did you try your battery in her phone to see if her phone charges your battery? If the answer is yes to both questions and you still have the problem then it is probably not a battery issue. I would start by making sure the charge port on your phone is clean and free of debris. There could be dirt or lint built up in the port which may cause problems like this. Try cleaning the port to see if it helps at all. If the port is free of debris but still doesn't respond to the charger being connected or when connected to a PC than the charge port on your phone is likely the problem. You may need to replace the charge port in the phone to fix the issue. I believe it is soldered to the logic board so it may require some solder work to replace the charge port. There is also a chance the charging IC on the logic board is faulty but this is not as likely to occur as a faulty charge port under normal circumstances. It usually takes using the wrong rated charger or trying to power on a phone after it has gotten wet or similar situations that can damage the charging IC. So more than likely a new charge port should fix the problem. Good luck.

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