when I change charging connector my phone gone dead and no responce.

i have a samsung grand 2 ,when charging volt is 1.65-2.35v is blinking then ,i was change its charging usb socket after that my phone gone dead and no reasponce any but still charging voltage is blinking on battery connector when connect it with charger but not show charging and not turn on my phone ? how to solve this problem ? please help me any one its urgent .

for your information i have to change another battery and usb socket,and no shorting on pcb. thas all.