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Got the solder gun. It’s a pen like, meant for electronics. I’ll buy a stand (it’s $2 with a sponge)

But what flux should I use (I need a cheap one) Not plumbing flux haha, like the one @dosdude1 used in his video, the flux in the syringe, on the iMac G3 Bondi/Blueberry G4 upgrade.

The clear stuff.

BGA soldering is pretty advanced stuff and requires a good understanding and knowledge of whats going on

I highly recommend you just use a professional BGA soldering service

its pretty clear you do not have the equipment or sadly basic understanding of how it all works

so please just pay someone who knows well what they are doing do the work for you rather then trying it yourself and ruin otherwise perfectly good hardware!
 
Got it. I have a logic board from an iBook G3 Snow that I disassembled, in 15 minutes!

BGA soldering is pretty advanced stuff and requires a good understanding and knowledge of whats going on...I highly recommend you just use a professional BGA soldering service...please just pay someone who knows well what they are doing do the work for you rather then trying it yourself and ruin otherwise perfectly good hardware!

Yes. Again, here is an example of a BGA rework station -- the kind of hardware you'd need to desolder and solder BGA connections on large motherboard chips, which is the task you're trying to do. It's very big, very expensive, and requires a fair bit of experience to operate effectively.

I definitely understand why you want to do this, but one can't realistically do any kind of BGA work (beyond a short-term band-aid solution for failing hardware) with a common soldering iron and hot air gun. There are definitely lots of tutorials and instructables out there on how to do just that, but even they concede that one needs professional level hardware like a BGA rework station to be effective.

If I were in your place, I'd contact someone like dosdude1 to get an idea of how much they would charge to do the work necessary to swap the CPU. Or I'd start looking and saving for a G4 iBook on eBay. You're still welcome to try doing it yourself but there's a very high chance that the CPU or motherboard wouldn't survive.
 
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Or like someone else suggested, get a G4 1.25/1.5Ghz eMac which are very nice machines. Or if you definitely want an iMac, get a G4 1.25Ghz iMac which is a great looking machine and you'll get for a hell of a lot cheaper than what you're proposing to do!
 
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