R40 CPU FAN??

[mineonenj156]

I have two Thinkpads R40 one needs replacing DC jack and the other one I dont know but maybe you guys can help me out. I noticed that when the laptop was runnig it was so hot that it locked down. So I went and brought a new fan and hook it up onto the cpu. Now when the keyboard is off still and when I turn it on the fan spins for like 2 mintues then xp logo appears on the screen then the fan stops. Is that mean the motherboard is bad?

[ajkula66]

What happens if you remove the hard drive?

Try downloading PC-Doctor for DOS, burn a disk, boot from it and run full diagnostics...

Are you getting a fan error at any point?

[mineonenj156]

Im not getting any error if I put it under a ac vent to cool it down. But the fan spins for a mintue then stops then couple of mintues back on then off. I never seen this done before. If I take the laptop off the ac vent because its cooling it , it starts getting hot and I can go into the start menu and click on things then locks down. I replaced 3 fans and im kinda ready to throw the laptop out the window...Im stress out.....

[ajkula66]

Just make sure it doesn't land on anyone's head or car...

That does sound like the thermal sensor on the motherboard has gone haywire...

[RealBlackStuff]

Did you apply thermal paste between fan and CPU?
It's normal for the fan to start at boot-time for a few seconds, then go OFF for a while, and only turn ON again whenever it gets hot in the TP.

[mineonenj156]

I put thermal paste between fan and CPU already and still does the same thing. I guess I can use the rest of the R40 for parts. O well.....