You need to either take it apart and replace the thermal paste on the cpu and gpu with arctic silver thermal paste and if that works (most likely the problem with most fat nand or nor models) you'll be good to go. If that doesn't work it will most likely need reballed. I have a real lingerie station or you can find a pc repair shop locally and tell them it needs reballed and see if they can.. an average PS3 reballed price is 80-100$... like @
Knucklehead said, I use to mod and repair as well but on the ps3.. I can also jailbreak it too