MagSafe DC Power Jack voltage? 820-2879 doesn't turn on

Hi,

So I have a 13" Macbook Pro Mid 2010 that doesn't want to turn on. I do get a green magsafe light but it doesn't want to charge the battery (The motherboard version is 820-2879).

If I remove the battery and measure PPBUS_G3H, I get 12.4v and it slowly goes down to 3v and instantly jumps to 12.4v again (I lose about 2 voltage a second. This power drop cycles forever). If I plug the battery in, I get a constant 12.4v (No voltage drop).

When I measure PP18V5_DCIN_FUSE (With the battery off) I get 16.03v (Instead of the 18.5v shown in the datasheet I have). PP18V5_DCIN_FUSE gives me 16.03v and it suddenly drops to 15.55v and back up to 16.03v (This power drop cycles forever too).

Could it be that the DC powerjack (J6900) is the problem? Shouldn't it be giving me a solid 18v instead of 16v (I don't have a working board to this the power on it)?

I do have a original Macbook Charger and I know it works (I've tested it on my friends macbook and it charges fine).

Any help would be amazing!

Thanks!