Question about Dell (Fan Only) M/N AFC0912DE, DC12V, 2.50A, D/N P2780 P2780

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Dell dimension 8400 p2780 fan replacement

Need a upgrade

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4 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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BigZ1981
  • 24 Answers

SOURCE: Fan Noise on Dell Dimension 8100

All computer fans have a general design.  The name in front of "fan" really refers to the designation.  You'll see case fan, processor fan, CPU fan, cooling fan, etc.  In the case of CPU/Processor fan, some are sold with heatsinks (the metal block sitting on top of your CPU).

The first thing you want to do is make sure the fan is clean.  Chances are dust buildup is causing the excess noise.

If that's not the case and you're looking to replace the fan, then you first need to find out the size of the fan. General sizes(diameter X width in mm) are listed on this page:

http://www.svc.com/case-fans.html

Generally, you're looking for something that will match the size of what you're replacing & push enough air at a reasonable noise level to cool the heatsink/CPU.  You want to stay in the area of 30dBA max for noise.  You also want to see if it has a 3-pin or 4-pin connection.

For example, if you have an 80mm fan, I would suggest something like this:

http://www.svc.com/saf-b82-19.html

It's pretty quiet with good airflow.  Also, it has a 3-pin connection, but includes an adapter for a 4-pin connection.

Z

Posted on Oct 27, 2007

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bob_computer
  • 3153 Answers

SOURCE: I have a dell Dimension 8400. The cooling fan

Your fan speeds up and slows down in response to temperature inside the computer. More so the CPU.

I would suggest getting a can of compressed air made for computers

take it outside, take of the side and blow all the gunk out of there, Really go to town around the fan (you might want to wear eye protection)
While you are in there just check that the CPU cooler itself is not loose

If it is it will have to be re-seated.

If it needs re-seating don't just take it off and put it back on as that might make things worse with your temperature problem they have to be cleaned and new thermal grease put on ($2-5)

DON'T remove the CPU just the fan/cooler assembly.

You must clean both the surfaces without scraping anything off. Use isopropynol alcohol and cotton bud sticks until both surfaces are clean, you can use your finger nail to scrape harder residue if you wish but nothing else.

DON'T pour the alcohol over the CPU

Now apply some new thermal grease (most computer shops have it)

Be careful about how much you put on

Here are
some basic instructions


Once you have re-assembled your cooler and re-connected it check everything is OK and power up the computer.

If everything went to plan you should now be back in business

Posted on Nov 25, 2009

FullOnYtee
  • 203 Answers

SOURCE: I have this fan on my Dell Dimension 8400. I

Check any Online P.C. shop and check the Fan in question details then look for 1 to match, can recommend a good online store if your from the U.K. let me know here...

Posted on Aug 21, 2010

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1 Answer

Can not get computer to power back up no lights on front o rear just little light on mother board have dell 8400


Bad Power Supply, sscorbett.

Usually you have enough power to light LED lights, (Like the harddrive activity LED light for add-in cards, that you see on the motherboard), and spin fans, but Not enough power to turn the Processor on.

Dell Support >Dimension 8400 > Service Manual

http://support.dell.com/support/edocs/systems/dim8400/SM/index.htm

Technical Overview > System Board Components

http://support.dell.com/support/edocs/systems/dim8400/SM/techov.htm#wp1052739

harddrive activity light for add-in cards (SCSI LED)

The Dimension 8400 comes with an ATX style of Power Supply, that has a maximum rated Wattage of 250 Watts.
1) ALL of the LED lights combined use less than 1 Watt of power.
2) EACH fan uses 2 to 3 Watts
3) A typical Processor can use 51 to 125 Watts.

Your Power Supply just has enough power to light that LED light.
Weak voltage power rail.
Replace the Power Supply.

[ There are three power rails inside that SMPS.
Switched-Mode Power Supply.

1) The 3.3 Volt power rail
2) The 5 Volt power rail
3) The 12 Volt power rail ]

The ATX form factor for a Power Supply refers to the size, and shape of the case, for one.
Approximately 6 inches Wide, 5.5 inches Long, and 3-1/2 inches Tall.
The ATX power supply case in the Dimension 8400 however, is shorter in length.
It is 4 inches Long. (Depth)

Not an advertisement for the website, nor manufacturer.
Reference for the case size, and power cables needed,

http://www.cputopia.com/hp-400w-dell-dimension-8400.html

Scroll down to see the connectors of the various power cables needed.

You may have a Power Supply with these dimensions, and needed power cables, in an unused computer.
Perhaps someone has upgraded to a better computer, and has an unused computer that you can temporarily borrow the Power Supply for a test unit.

Make sure it has at least 250 Watts (Maximum rated wattage), plus,

1) 20-pin ATX main power cable. (Or a 20 + 4-pin ATX main power cable)

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20

[ 20 + 4-pin ATX main power cable,

http://www.playtool.com/pages/psuconnectors/connectors.html#atxmain20plus4 ]

2) 4-pin ATX +12 Volt power cable

http://www.playtool.com/pages/psuconnectors/connectors.html#atx12v4

Plus the various power cables needed for the Harddrive, optical drive/s, and computer case fan/s, if it/they do not connect to the motherboard.

Oct 21, 2010 | Dell Dimension 8400 power supply ** FREE...

1 Answer

I have this fan on my Dell Dimension 8400. I cannot stand the noise any more. Is there a direct replacement that is quieter? Bill


Check any Online P.C. shop and check the Fan in question details then look for 1 to match, can recommend a good online store if your from the U.K. let me know here...

Aug 21, 2010 | Dell (Fan Only) M/N AFC0912DE, DC12V,...

1 Answer

CPU Fan sounds like a jet and computer won't start


It sounds more like the hard drive, the fan has nothing to do with your computer booting up. If the hard drive is starting to go bad it will not boot up, that's what it sounds like your computer is doing. I recommend checking out the hard drive and replacing it.

Jul 02, 2010 | Dell (Fan Only) M/N AFC0912DE, DC12V,...

1 Answer

Dell dimension 8400 will not start.


no man try to take out the modem ( last pci slot on the botom of the board) and see if you have any luck if not you going to need a new motherboard thanks and good luck

Oct 11, 2009 | Dell Dimension 8400 PC Desktop

2 Answers

Dell Dimension 8400 Start up Fan Noise


Might be a hard drive issue. I had the same problem with one of My desktops. I replaced the hard drive and it worked fine.

Jul 01, 2009 | Dell Dimension 8400 PC Desktop

3 Answers

Dell 8400 runaway fan no diagnostic lights and very ocassionally it starts normally


Which fan?, the cpu fan or the cpu fan?

Most Dell pc come with a below average power supply. I recommend replacing your power supply with a better one. Do a search on Google for a good replacement power supply for you Dell 8400.

Please rate response.

Feb 17, 2009 | Dell Dimension 8400 PC Desktop

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