Topic Title: Need 6850 Fan Pin Polarity
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Created On: 02/25/2014 11:53 PM
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 02/25/2014 11:53 PM
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lighterfluid
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I'm attaching the Accelero Xtreme III to my HIS H685F1GD Radeon HD 6850.  There are two pins where the fan plug is connected.  I ripped off the plastic sheath that served as a guide for the fan plug.  I can put the plastic sheath back on but I'm not sure which pin is positive and which is negative/ground.  I tried examining the board but I don't see any indicator.

Can anyone advise which pin should take the red cord and which should take the black?  The Accelero has a 3-pin connector but I think the third cord (yellow) is optional.



Edited: 03/05/2014 at 01:25 AM by lighterfluid
 02/26/2014 03:42 AM
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zipsi
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Based on this randomly googled image of a HD6850:

Appears that the top one is negative, followed by positive, ground and PWM.



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 02/26/2014 10:42 AM
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lighterfluid
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Thanks.  Still questionable - that particular board appears to have a 4-pin male power input.  I'll keep googling images.

 02/27/2014 04:53 AM
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zipsi
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Its male on this image as well, a female fan cable is plugged into it.



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 02/27/2014 03:31 PM
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black_zion
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Try it one way, and if it sucks instead of blows, or doesn't work at all, then flip it around.

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 03/04/2014 11:10 PM
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lighterfluid
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I suppose I can do that - plug it in real quick and line up the red and black leads.  I'll give it a shot and see what happens.

 03/05/2014 01:23 AM
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lighterfluid
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Can anyone locate a document that states where each component is on the card, or at least the majour ones? I am being told to place an insulating film over the voltage regulators but I don't know where they are.  I've googled for hours and checked the AMD support document - cannot find the chipset layout.

 03/05/2014 08:31 AM
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Vegan
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most better thermal interface material is not conductive

 



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 03/05/2014 07:10 PM
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stumped
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If you haven't figured this out by now, you should pack everything up and take it to someone who knows what they are doing.



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 03/06/2014 12:28 AM
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lighterfluid
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Too late.  I fried at least my motherboard this morning.  The plug for the Arctic Acellero Xtreme III connecting from the fan to the motherboard is three pins: yellow, black and red.  Based on the above picture above I lined up the plug on the two male pins of the 6850 so the female yellow pin was hanging off to the right.  The red and black female pins were in place.

However, there is also a plug from the power supply, which splits into 7V or 12V male sockets, that have to plug into the power cord mentioned above.  The plug connecting to either the 7V or 12V socket has 4 female pins in order of black, red, yellow, blue.  Since the 12/7V sockets only have 2 male pins I chose the 12V and there was only 1 way to fit the female plug into the socket so I attached it.

Put everything back together, powered up my machine, and there was a bright light emenating from (what appeared to be) the video card, a fizzing noise like small current sparkling, and the odor of something burning.  I powered off the computer, reversed the power plug on the video card's end and powered everything back on.  No video.

Took out the 6850, rebooted and tried the onboard video card - no video.  Put in the nVidia card I was using while getting the fan attached to the 6850 - no video. Also, I noticed there was no power being delivered to the hard drive.  I came home from work today and powered on the machine again using the onboard video - nothing, and the fan over the CPU is "twitching".  Guess the mobo is fried, and potentially the 6850 and PSU.  Hopefully I can get some decent replacements.

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