Ps3 fat when I turn it on fan goes crazy then it shuts down

@syrostech

the fan is PWM controlled so that third wire, the grey one, is used to control the fan speed. The voltage for the brown wire should always be at 12v and Black is the ground. Check this site for more info. The issue here is that the fan controller gets input from various thermistors (not transistor but thermistor) to respond to increased temperatures at various locations. You could trace the circuits via the diagram and check the thermistors etc, or you could try to modify your fan via a separate fan controller. Here is a pretty good mod for that. Hope this helps, good luck.

Of course you do want to make sure your PS3 is really not getting to hot. Also a reflow might work for a short while but it is definitely not permanent. Something like this would be what you are looking at.

Let us know what model this PS3 (even better is you know what motherboard it uses) is so we can look into further possibilities.