MacBook Pro won't charge while it's turned on, only while turned off.

Hello There,

I have a late 2011 A1286 MacBook Pro that works relatively fine, unless for the GPU fault that was properly disabled.

When it's turned off, it charges fine and the MagSafe light goes Orange, and when fully charged it goes Green. On the other hand, if I have it turned on, and the battery is running low, and I plug it in the MagSafe, it goes orange, for about 5 min and, then, the MagSafe suddenly turns off. I have already replaced the battery for a new one and the issue still persists.

However, when I take the battery out and plugged it in the MagSafe, and the light stayed Green, and the computer stayed on without any issue.

It seems to me, there’s an issue with it when it turning over to straight DC power when the battery is physically connected to it and it's turned on. I have already tried resetting the SMC and replaced the MagSafe for a new (original) one unsuccessful.

I ran EFI ASD that gives me a fault in PBUS VP0R that is reading about 0.8 V instead of about 8 V. However, this issue only happens when it is plugged to the battery. When it's plugged into Magsafe, the PBUS sense yields the proper voltage.

How could I fix it? Any Input on this threat would be greatly appreciated!

Gerson.