go here for the alternate points:
http://forums.xbox-s...o...699075&st=0 there are 3 spots for it one of which require your to scrape down the motherboard to get to the copper you can solder to the point. the first are obvious db1f1 and FT1u both of those I screwed up though I managed to solder to the lifted trace on FT1u and still make it work because db1f1 is a test point on the board and only goes through the board to the bottom and leads to the southbridge. You can see the point Chaosplt was talking about in post 13 in that topic(this is the point you will need to scrape down to get to the copper). My advice is to get some new solder on ft1u and once you get a good connection on that point with the diode be sure to super glue it, otherwise if you lift the trace just solder to that then super glue it after confirming that it works.
Also you should add a 1/4 watt 330 ohm resistor like the diagram below suggests.

And DON'T use stranded wire, something I wish I was told when I first started this.
Edit: after reading your post again I've got to say sorry I don't know of any alternate top spots for db1f1, I think after that they are all based on the bottom, but that shouldn't be a problem because I used 24 gauge wire to solder my points and without super glue they still didn't touch the chassis of the 360, though you should still super glue the points so they don't break off.