Well, keep in mind that i've never tried the "burning method" before myself... hence why maybe someone else here could offer some input on it. If you want to give it a shot though, I suppose it's an all or nothing repair now anyway. The only thing is having never tried it before, I can't endorse it. Follow the tutorial though, i'm sure it has a lot more information in it than I could ever provide on the topic.then burning it shall be.the machine is broken down to bits, i have nice, clean access to the gpu. it's hard to miss, since it has a nice 'ati' logo on top. i'm assuming that i have to place the candle light on the top as opposed to the bottom seen in the burning 'tutorial'. the g4 ibooks have the gpu on the upper side of the mainboard, and it wouldn't make much sense to start heating the board itself on the bottom: the gpu might come even looser. please correct me if i'm wrong.
The G3 iBooks had the GPU on the underside of the mainboard, while the G4 iBooks have the GPU mounted to the top side. So you would need to work on the top side of the board, basically wherever the ATI Logo is, that's where you need to do the repair. In addition it's gravity working here, so knocking the machine or turning it over or anything like that will possibly work the chip loose. Try to keep it as stable as possible during the repair.