New charging port won't charge

Hey guys,

I've had to replace the charging socket of my Sony Z5 Compact because the old one wouldn't charge my phone anymore/was super wobbly. (I've also changed the battery). However, every time I plug it in, it will recognise it being charged, upon which the Sony screen will display but shortly after that the red light will turn off and it'll return to the battery screen, which isn't displayed as charging. Any ideas on how to fix it? Any help would be very much appreciated!