Samsung Megagt-i9205 Not Charging Error

Hi guys I have Samsung Galaxy Mega i9205
When I connected it with charging it does ON him self but do not charge…….
When I put battery normally and do not connect with charger it does not ON himself……
Can some one help me where can be problem in PCB or I need to change Charging port, but I check with multi meter charging port is working but do not charge
Chen any one please send me where is charging Ic i9205, I tried but did not found thanks