1 - 2 uren
One day my PS3 had the yellow light of death. Tried the hairdryer method which didn't work. Got a new PS3 slim replacement but my son kept on asking me to fix the old one.
Watched the tutorial video several times and went along with the video as I disassembled my PS3. Had to look for other videos on doing the actual repair (using the heat gun and applying the thermal paste). Reassembling was hard since going through each step in the video in reverse was confusing. Ended up having one screw which I failed to put back. I wasn't expecting it to work from the start and was very surprised and happy it did.
In other videos they advise to use the heatgun for 1 and a half minutes on each area instead of 25 seconds so that's what I did. I honestly am uncertain if the YLOD is caused by both drying up of the thermal paste and melting of the sodder. I'm thinking having at least one of them is enough to cause the YLOD and in my case maybe it was just because the thermal paste dried out. This seems easier to fix than reflowing the sodder. Maybe that's also why I succeeded. My first advise is not to expect it to work because it really may not, as experienced and shared by others here. Set enough time for the fix. It took me almost four hours from start to finish. Take care in labeling and sorting out the screws and pieces. I was thinking of using permanent markers of different colors to mark the screws and where they were supposed to go. Find a video on reassembling the PS3 to guide you and make it easier for you. Good luck and I hope you can put in your own successful repair story in the future.