sony xperia Z5 charging and battery problem

Hi guys

I have sony xperia z5 which didn't want to charge. I replace the charging connector and still doesn't want to charge.

When I plug it in the red light comes up and the phone show the battery but after that it just disappear. It shows also the sony starting screen and then switch off.

I put z3 battery to see if it does start charging and it did. But when I unplug it and plug again it did the same issue as before. Just red light comes up and the switch off and nothing.

Anybody ever come across this kind of issue before?

Please help

Thanks