Before you can use alternate points you must repair the broken traces, otherwise your Xbox won't even turn on. Repair your traces and verify the repair with continuity checks.
As for alternate LAD2 points, there are 3 that I know of all on the underside of the board. Simply follow the LAD2 trace and you will locate 3 other points that you can use for your LPC rebuild. However, none of these other points are exposed pads like the original LAD2 point, so you'll have to carefully remove the protective coating of the motherboard in order to expose the copper and make use of them. These points are more difficult to solder than the original point, and if you're not carefull you can ruin the trace at these points as well, so take your time when soldering them.
