the xclamp fix for the back of the mother board is the most common fix of the RROD's. However some say it fixes it permenatly more say its a temporary fix. Ive tried it twice on 2 different consoles. and of course they were both temporary.
The soldering losseness refers to that chip that the heat sink sits on top of. Im brave enough to put clamps on a mother board. but I aint tryin to solder anything. That will for sure fuck my console...lol