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Swap a PII power supply with a P4?

By Bucko77 ·
G'day

I have an old HP with an Asus KL97-XV mobo which i'm led to believe is made especially for HP.

The Power Supply is dead and a lovely man from the HP Trade Center said he will kindly send me another one for the same price that I paid for the half decent full tower P4 case with 400W P/S.

The dead power supply had a 3 female pin connector (P to the mobo marked PS FAN and from the mobo doco is two ground pins and a +12V pin in the middle.

Is there some type of connector changer or something that will allow me to use the 400w P4 power supply???? When I boot disconnected, I get HDD, case fan, and Floppy action but no video and no further.

Any thoughts are appreciated.

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Swap a PII power supply with a P4?

by TheChas In reply to Swap a PII power supply w ...

Is this 3 pin connector similar to the small connectors for motherboard connected heat-sink fans?

If so, what you have is a power supply that used a remote fan connection.

This is done sometimes so that the PS fan can be monitored.

I suggest that you try plugging a small heat-sink or case fan to the 3 pin connector on the motherboard.

While the documentation may say that there are 2 ground pins, I suspect that one pin is used to monitor the fan RPM.
If PC health monitoring is enabled on the motherboard, they often do not boot with any monitored fan disconnected.

I would also double check that the HP power supply was indeed using a standard pin-out on the main power connector.

Chas

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Swap a PII power supply with a P4?

by TheChas In reply to Swap a PII power supply w ...

Had a BAD side thought.

It is possible when the power supply went, that it took the motherboard along with it.

Look at the large capacitors, resistors and transistors near the CPU.
You are looking for scorch marks, or bulges in the parts.
These are the voltage regulators that provide the CPU core voltage. If they are damaged, the motherboard can't boot.

Chas

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Swap a PII power supply with a P4?

by Bucko77 In reply to Swap a PII power supply w ...

You're spot on with the descption of the connector, it does look like a fan connector. I did actually plu a 12v case fan into it but nothing happened.

For lack of something to do, I also pulled the old PS apart and there does appear to be some extra circutry related to this connector and the fan inside the PS.

I started to suspect the health monitor situation that you also refer to and started to think the worst (coughing up the cash!!!)

So i started threatening to take to it with a large hacksaw and oxy torch. Now it's booting fine :) Installed the new sound card and everything's still good.

Thanks for your answer though, you confirmed my thoughts about the connector which is all I was really after, so the points are yours.

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Swap a PII power supply with a P4?

by Bucko77 In reply to Swap a PII power supply w ...

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