My only concern with an "oven" reball would be the capacitors and other components on the motherboard would be subjected to the same heat. With a heat gun, hot air wand, or rework station you can localize the heat to just the chipset that needs to be lifted.
I would revise that question then.
How about I do an oven reball, but shield the components not to be heated with a few layers of Aluminum foil?
don't know if it would work or not for sure with some of the ps3's sensitive components but i did do a oven reflow with a Nvidia video card and the pc its in still works and that was quite some time back...before i did it to the card it actually worked but you would have thought you was using a monochrome monitor..lol
It's possible that it would work that way.
The only other thing is getting the temperature right to get the chipset off the MB, then getting it cleaned up and ready for the reballed chip to be placed on the MB, then getting it back in the oven.
But then again OP did it with a heat gun and a piece of wood.
Necessity is the mother of invention!
just thought i would give a update for anyone that maybe interested but the machine is still working strong and the fan is operating normally,have been running it almost 24 hours a day to really test it out hardcore...
to the above post..the only thing about an oven reflow is you would really have to protect all the other components from getting the same temps as you don't want everything on the board coming unsoldered and protecting the capacitors is also very important but playdow or silly putty in these areas work fantastic as its what i did with a video card,just have to be sure to get it ALL off before powering up...
the way i remove the IHS is i just heat it up real good just using a hairdryer here...get it good and hot and then i try and slide working a razor over top the ram chips and it will sometimes just come free pretty easy but other times i do it exactly as this video here shows but i dont use as much force as it seems he is using,i have always just added more heat and work with it and i have always got them off without ever damaging them..but some force is ok as they can take more than you think,just be careful and be sure to go under the proper side so you don't damge anything when prying..