Hello this is my first time ever in a discussion board much less posting one but I was kind of desperate for help and information. This is a long post so bear with me. Like everyone else here who has, had, and will have a G3 ibook or looked at a G3 ibook forum i know that eventually the GPU will come loose from the logic board causing the Black Screen of death. From the various forums I have read, I have summised the two main reasons for failure are
1. The flexing of the logic board in the ibook causing mechanical stress on the GPU's Ball Grid Array (BGA).
2. The heat build up inside the ibook that only exacerbates the previous problem.
Naturally people have come up with clever ways of repairing their macs. Placing clasp on the ibook where the GPU is, placing a shim between the GPU and metal heat shield, sauteeing the GPU with Hot Air Gun to reflow the solder joints, and heating a coin (preferrably of English origin for some reason) to 250 degrees something? (never clarified celsius or fahrenheit) and placing atop the GPU to name a few. All clever but ultimate not a permanent fix to the problem because they are not a solution to the cause. Ultimately the joints of the GPU will come loose from the board. One could do the hot air thing but eventually one will end up destroying the chip. I have been reserching the ATI chip and this BGA and I stumbled upon a device called a Pin Grid Array or PGA (wikipedia or google it) and it appears to be the predecessor to the BGA. Like the BGA the PGA is designed for electronics. Instead of having these easily breakable solder balls it has pins pertruding from it that contact the board surface. However, they are more flexible than the BGA and thus less likely to fail as all they need is to make contact with a conductive part of the board which is easy if solder into the board. Anyway these PGA's also come with socket types (look up Pin Grid Array Socket). If one were to solder that stupid ATI GPU BGA on top of one of these sockets (in possibly just a kitchen oven). Then one could solder the card back down onto the board. It would provide permenently be fixed to it. Or at least an easy way to continually repair it for pennies.
So your probably wondering why I went through the history of repairing G3 ibooks if it is that easy. Well, like I said I am deperate for help and information. I have never seen the actual GPU on a ibook up close. I have seen images but from them I cannot tell if the GPU is soldered to the board as the BGA implies, or if it is actual part of the baord itself. The latter seems implausable as there are services that do reballing and so the GPU has to come off the board some how right? Also has anyone seen the the BGA grid design. I am aware that these reballing/re-flowing (there is a difference) services typically take X-ray images of the layout. If any has gotten the "surgery" or has images of either these X-rays or the actual bottom of these it would be appreciated if you would upload them for all to see. I asked one of the companies (superiorreballing or something) about this solution but they blew me off.
Anyway, I recently purchased two ibooks (800 and 900Mhz) and I would like to explore this solution in greater detail. I will continue to post my progress as I continue. It will be interesting to se e if this actually works as I am a electrical engineering student and have some experience with these types of soldering techniques. If this works I would be willing to sell for the right price. It would be after all the only one of its kind.
Sorry for the long post but I just wanted to set the stage for discussion of this problem. I will be posting this discussion on other forums too. Maybe the entire G3 ibook and maybe even G4 ibook community/market could benefit from this endeavor.