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I replaced the motherboard in my presario 1245. It boots up and runs find until it gets too hot. I replaced the fan with a new one still doesn't run.


Answers :

You say you replaced the fan, But did you also replace the heatsink? If not please check that
If you are 100% sure that the fan is OK , that the fan wiring is OK , and the fan is not starting when CPU gets over the critical temperature, then you have a faulty motherboard.

What happens is that the motherboard has either a defective temp sensor, or there is a broblem on motherboard cooling system socket.

To test the socket you just test that there is voltage in it .

To test the thermic sensor you connect a couple of different fans that you know are working to the motherboard, if they do not start, then the sensor is bad.

Motherboard are considered not serviceable at component level, if you have this kind of fault, then replace the motherboard.

The problem is however quite unusual , I have seen this happening (fan not starting up because of faulty MB) only a couple of times in my career.

Ensure first that you have not broken cooling fan contacts on wiring or connector, and that the fan is starting properly.

Also ensure you have used coolant paste between CPU surface and cooling system.

If windows start Download SpeedFan
to test your CPU temp.

Do not forget to rate the solution .

Many thanks.


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