This can prevent 3 RROD
OK here's how to do a 12v mod, but it's extremely loud. You will also lose the auto-adjusting functionality of the fans, where the voltage increases as the CPU temp does. That shouldn't be a problem though.
STEP ONE:
Take the RED and the BROWN wires shows below, and cut them off at the top of the plug, so you have the most wire left. Leave the BLACK and BLUE wires, as they're just grounds.
STEP TWO:
Twist, then solder the RED and BROWN wires together, then solder a third wire to that, about 5" long. Solder the OTHER end of the third wire to the pin shown below, either on the bottom of the motherboard, or onto the wire that does to the DVD drive.
And there ya go, both fans are now running at 12v. If you only want 1 fan to run at 12v, cut only one of the wires, RED or BROWN, and leave the other one alone. If you want 1 or both of the fans to run at 7v, then cut the BLACK and BLUE wires, and solder them to a 5v source on one of the USB plugs.
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Ok so thats the tut. Now the reason why this can prevent the 3 red lights of death is because the only reason why you get the 3 red light of death is because when your xbox 360 gets too hot the unleaded solder on the GPU begins to melt and cause bad contact between the chip and the mobo so keeping your 360 cool will prevent from the solder ever starting to melt.
Also the reason why the towel trick and the heatgun method are only temporary is because when you overheat the console you can make it so the solder melts and melts back into place making a connection between the mobo and the chip. So play your xbox 360 horizontal and make sure it is kept cool.
Also there is no way for the fans to "burn out" because the xbox 360 changes the voltage (from about 5 to 12 volts) when needed but the reason to keep it on 12v constantly makes it alot cooler and makes sure you dont get overheating problems, obviously the original cooling system isnt doing a very good job.
