Why is the MBP not charging?

Hi all.

Helping someone out with her macbook pro, all signs point to (99% certain) to the DC board connector.

The issue is the Macbook pro doesn't charge battery, or power on. (with AC connection alone), nor does the LED emitt at all. Yet with the AC disconnected and the battery in, the laptop runs just fine.

This points me directly to the DC in board as if it were the logoc board the mac would have problems on battery too.

The Macbook is out of warrenty

I'm simply asking just for conformation... Am I correct in that a replacment DC logic board would sove the issue ?

Just for the record, yes... i have reset the SMC ... and have replaced with new power adapter.. Still no good.