I got my PS3 through the pre-order back when it came out. It worked flawlessly up until about a year and a half ago. 11 years is pretty good, I'd say. It started acting up with the fan running really long and louder and louder, so I knew it was going to crash at some point. Found a wicked deal on a brand new unopened PS4 on a Facebook sale site. My spoiled teenage kid got it for Christmas, then wanted the XBox One, which was selling it for $100. So I got it, and a month later my PS3 goes down with the YLOD. So I hooked up the PS4 and forgot about the PS3 until a few weeks ago, when iFixit sent me an email (used them to fix my phones in the past) about fighting to be able to fix our electronics. So I supported the fight and then checked out the site and found they had a YLOD fix kit. Ordered it, and it says it's a difficult job, but honestly, there wasn't anything difficult about it at all. If anything was difficult, it was the number of screws to remove and keep track of, and pulling out the backup battery and plug was a little tricky in that you need to be extra cautious.
Got the job done, hooked it up, and BAM! It works almost good as new...
Only issue now is that the fan is super loud, and I wish I would have replaced that too.
DONT DISCARD YOUR OLD ELECTRONICS—fix them!!
Repair went smoothly... Like I said, if anything was difficult, it was keeping track of the screws. The way I manage that is, I lay them out in the same pattern from where I take them out. Most times screws are in groups of levels, so with each level I'll lay out one level pattern, then start another. This can be avoided if you place the screw back in the holes of a part you remove, but sometimes when picking the part back up, the screws fall out. So be careful either way.
And don't be scared of the heating process... Just hold the heat gun about an inch away, keep it moving in a circular motion over the 4 chip areas individually, and then same thing when you pre-heat the entire board—I used a grid pattern. Took maybe a minute on the board, and then 25-30 seconds per chip.
The kit it comes with is almost all you need... My only suggestion would be a set of the tweezers that have a curled end, which came in my Pro Tech Toolkit. I used it to pry up the plug for the back-up battery while holding down the socket it was plugged into, as to not rip the socket from the motherboard. Probably could have accomplished that with the spudger and supplied flathead screwdriver as well, but I have the Pro Tech Toolkit, so I like to use it as much as possible to justify paying $80 for it at Radio Shack like 6 years ago lol
If I could go back, I would have replaced the fan as well... There is an upgraded fan I read about that's quieter, has more fins for better cooling, and uses less energy or something. So if you are about to do this job, go ahead and replace the fan while you have everything apart.