Hi. I currently am trying to power my cell phone through a solar charger. I have to connect a cord to a female Type A usb cord(with a white part on the inside on the end of the cord). When I attach a male Type A usb cord (with a black part on the inside of the end of the cord), my phone does not charge. I know that the solar charger does not have a defect because when I attach a different phone usb cord (that has a white part on the end of the inside of the cord), the other phone charges. I think it has to do with the colors of the inside of the usb cords. Please help me solve this problem. Thanks in advance!