Well if you have read this thread in it's entirety:
http://forums.xbox-scene.com/index.php?sho...579364&st=0 , and especially read what SMTRework had to say about reballing the cpu/gpu with lead solder balls, then you will get a pretty good idea of what causes the 3rlod.
Well according to SMTRework. the problem seems to be: not enough cooling, the use of lead-free solder balls to attach the gpu/cpu to the mobo (instead of solder that contains lead), and the warpring of the motherboard.
Putting those three aspects together one could say, the combination of heat and pressure to the mobo causes the lead-free solder balls on the gpu/cpu to detach from the warped mobo; causing the 3rlod. He saids the cpu gets hotter than the gpu, thus causing more solder balls to detach from the cpu than the gpu
He said the best fix for this was to get a BGA (ball gride array) re-work, which would replace all the lead-free solder balls with lead ones. However this isn't a DIY job, so it requires paying a professional around 200 dollars to use professional/expensive eqipment to get the job done.
He also stated that since lead-free solder has a higher melting point then lead solder, when people overheat their consoles, they are NOT reflowing the solder balls, but actually re-warping the board in hopes that the cpu/gpu re-connects with the mobo. So the overheating temperature does not reach high enough to melt the solder balls, but to warp the mobo.
I also read on that thread there there is some law that doesn't allow companies to use lead solder in children's toys and that's why MS used lead-free solder.
I also read on wikipedia that lead-free solder does not work well with electronics that experience tremendous heat.
So lets say you don't want to spend the money to get the BGA rework. Then I guess the only options are to rig up an adequate cooling setup and take pressure off of the board by doing the x-clamp fix (Lawdogs or RBJTech) and adding extra support under the mobo , which would reduce the heat and pressure that causes the mobo to warp and detach from the cpu/gpu.
I'm guess you already know, but there is a stick link in the hardware modification section of this site that links to a good amount of cooling and pressure releasing mods.
I hope this helps.
This post has been edited by SlickWilly440: Nov 7 2007, 06:39 PM