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Compaq Presario 2500 laptop fans???

June 30, 2010 at 09:06:25
Specs: Windows Vista, AMD 3800+ dual
Hi, I have just finished dismantling the above. Reason: kept freezing.
I found that the HSF had not a skeric of T/paste, so I cleaned it and whilst I had it open replaced the Celeron 2.8 with a P4 2.8 (L2 cache up 512 from 128 and FSB up 533 from 400, a noticeable uplift in speed resulted). I applied Artic Ceramique as per the site instructions and reassembled the comp. Temps prior to cleanout were CPU 55c to 60c and HD ( Hitachi 7200rpm) 47c at idle. I now have CPU 58c and the HD 47c at idle.
This comp has 3 fans, #1 is on nearly all the time, #2 only cuts in if temp goes above 62c and the #3 fan( vey small ) appears to pull cool air in and blows (via a ducted housing) onto the CPU. This #3 fan is what appears to be at fault as it now never comes on. I went back into the comp and checked to see if it was connected and found it to be so.
Question: Can I connect the #3 fan to the #1 fan and have it running all the time, as in when the temp turns the #1 fan on?
Any help or suggestions greatly appreciated.

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June 30, 2010 at 10:00:56
This comp has made a liar of me. I wrote the above and whilst writing it I had the thought , why not force the temps up and see if the #3 fan cut in. So I turned it on and it has been sat idling at 44c for the last 20 minutes.

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July 2, 2010 at 11:25:03
Do be cautious of the TDP of certain CPU's when it comes to laptops.

PowerMac 9600(1 ghz G4)
512mb RAM
50gb SCSI
ATi 9200 PCI

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July 2, 2010 at 23:46:58
Outlander, I appreciate your answer. I had spent several hours confirming that the P4 specs were OK.
I have rewired the #3 fan to a USB port and have the fan working all the time. Has lowered the temp considerably.

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