Galaxy Tab still no working after battery & charging port replacement.

Hi all,

I have a tab 3 that went flat a few weeks ago. I tried to charge it and nothing happened.

I did a bit of searching, tried multiple button combinations but nothing worked. I replaced the charging port first, no change. I then replaced the battery and still it doesn't show any signs of life.

I used a multimeter and confirmed that the charging port is working, I am also using the Samsung travel charger but with a generic cable.

Just wondering if anyone has any further suggestions? Thank you very much.