I also had to do the two contacts on the bottom and the contacts on the top-side of the board (like where the two metal prongs on the bottom come up). The picture you posted, I think, just shows the three pads on the bottom but that didn't work by itself for me [like at all; I found I had to push the plug in exactly as I did before soldering, so I figured it had to be other contact points].
And now it doesn't get past the mouse (lol... unreal). This is the Kanga I got from Uniserver, which was in pretty good shape. I actually used this guy a bit last year. I put in a new PRAM battery and there was no noticeable corrosion as of a month ago. So I'm not clear on how this happened; and it's right above the PCMCIA enclosure and on the other side of (I think) the VLSI chip. Really disappointing. I'm soaking it in scrubbing bubbles but I think that must be it. Next step will be a wash. I'd be really shocked/annoyed if it died.