Question about Dell (8N816) Motherboard

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I have a dell optiplex GX298 that I am trying to fix but i do not have any manual. the problem is that I cannot identify the fan speed and sensor pins for the cpu fan, hense i keep getting the pu fan failure message when i boot. the oriinal fan died and i am converting one to it.

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You should try to find a fan that is compatible with the motherboard. if you try to "make one fit" you could end up burning up the CPU

Posted on Feb 07, 2009

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Optiplex 760 airflow sensor


Sounds like your system does not have proper ventilation. It may be too close to walls or something that is blocking the airflow. Maybe the fans and vents are clogged with dust. If so blow it out with a can of compressed air.

According to your manual:

Alert! Air temperature sensor not detected - For any computer type except the ultra small form-factor computer, ensure that all cables are securely fastened to the I/O panel and to the system board and reboot your computer. If this does not resolve the problem or if you have an ultra small form-factor computer, contact Dell (see Contacting Dell).

See link below for the manual.

http://support.dell.com/support/edocs/systems/Op745/en/UG_en/trouble.htm

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My dell optiplex gx 620 system fan run so fast and produse a lot of noise when i play games or downloading data from net


Open up the computer and clean the dust out of the fan and processor heat sink. If it is a temperature-controlled variable speed fan, it will probably not have to work so hard to keep the processor cool.

If it is a fixed-speed fan, it may be getting loud because the bearings are wearing out. Gently try to rock the fan blade unit - it should not have any wobble or slop in the bearings, and it should rotate easily.

If necessary, clean as much dust as you can out of the power supply without taking it apart.

Do not use a regular vacuum cleaner to **** dust off the motherboard. The high-velocity airflow may generate electrostatic charges that can damage the board. It's probably OK to vacuum out the heat sink if you hold the fan still to keep the vacuum cleaner from over-speeding it.

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I have dell optiplex gx280 computer.i am facing problem of CPU high fan speed when i turn on the PC.it goes to full noise like a jet fighter and nothing get appeared on the screen and fan continuously gone...


dells usually go full blast on power up then slow down to normal,sounds like fan is not responding to slow down signal i would try replacing fan, its got to be a dell fan

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Apply pressure on the heat sink fan right before you press the power button and continue applying pressure. Watch your screen if you see it boot this means its a problem with your processor clamp that applies pressure to the processor. Try to remove the top part of the clamp. Shouldn't be too hard with some needle nose pliers. Then just replace the heat sink and fan with out that clamp.  

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1 Answer

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The fan bearings may be going bad. Variable speeds are normal as the fan adjusts to the cooling requirements.

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2 Answers

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Unfortunately this seems so be a motherboard problem, Dell's solution is to replace the motherboard I'm not sure there's much you can do at home or work to fix this - if it's still under warranty get dell to replace the motherboard if not im afraid its the bin for it sorry

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