an7 nb fan dying out sporadically (UPDATED PLEASE HELP!!!)

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mavsham

Member
Apr 20, 2001
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the nb fan on my an7 is dying out sporadically dropping from 5400 rpm to 120 rpm!!! i have no clue as to what i scausing this. everything was working ok for a month and now suddenly this has come up...

any one has any clues as to what can fix this? my config is

amd xp 2500+
abit an7
POWMAX CP769PL-6 400W case
fail safe defaults config in bios


the bios is what came with the mobo, i have not upgraded it or anyhting.. i am not good at the hardware stuff... and am worried this my **** up my entire system which is under a month old.

basically while windows is running a very loud two tone siren starts blaring... this happened last night... so i opened the case tried to start the comp so i could look at the nb fan. and each time i would start the comp the siren would go on... so i did this a few and then it just stopped...

the only thing i can think of is that it is may be being caused by my psu. is this possible? coz the case was very cheap ($30) and came with a 400W psu so i am wondering if thats the problem... i wanted to get some opinions from veterans here

please please help!!
 
W

WobbleWobble

Diamond Member
Jun 29, 2001
4,867
1
0
Does the fan actually slow down?

These fans have been prone to failure. You could try adding a drop of motor oil to the fan by lifting the sticker on the fan and there'll be a place to drop oil.

Many nForce 2 boards use a fanless northbridge cooler. Your board probably won't die, but may become unstable if the fan isn't working properly. You can also replace it with a bigger heatsink like the Zalman ones and not have to worry about a fan altogether.
 
M

mavsham

Member
Apr 20, 2001
48
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0
yes the fan slows down... or starts slow... around 3000 rpm.... one of these 2 always happens... i have seen it visually...

one thing i noticed is that the fan when working properly is very very quiet... however it starts making a fairly lound sound (relative) when it slows... do u think its dust?

there is no visible dust however...? thanks a million for your response..

also what do u think is better.. should i just get a large heat sink? is it easy to install though? coz i am no expert at this

thanks again
 
W

WobbleWobble

Diamond Member
Jun 29, 2001
4,867
1
0
Dust contributes, but those fans are generally low quality.

It's pretty easy to replace the fan/heatsink. You have to take out the motherboard, pop the push pins out and you may have to twist the fan off because it may be also held using a adhesive thermal pad. The northbridge heatsink you buy will most likely come with instructions.
 
S

slpaulson

Diamond Member
Jun 5, 2000
4,414
14
81
Originally posted by: Chopstick217
Alot of Abit boards have faulty Nb fans. Mine failed after just one month. So, I simply replaced mine with this Link
Click to expand...


Mine died after a couple months and I got the same one as above.
It seems to work fine.
 
M

mavsham

Member
Apr 20, 2001
48
0
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i am going to go for this as well then and am hoping it will do the trick... does the stuff come with a manual or no? also how do u remove the current one :eek: i am sorry if these questions are stupid but i am really am a novice here... i know there are 2 white pins on either side... they dont seem to unsrew.. and i am way to paranoid to pull/apply extra force :eek: a heads up would be greatly appreciated

thanks to all who have replied so promptly...
 
M

mavsham

Member
Apr 20, 2001
48
0
0
i installed the vantec iceberg today.. and everything started up fine but the siren would still play..

the new fan was working fine.. quiet.. and full speed.. but the BIOS wont report the nb fan speed now...

so i clear the cmos data.. and then the siren is gone..!!! the fan speed is still reported as 0... and OFF in Abit EQ

pleaase help .. whats wrong here?

also the comp is working fine.. i am posting this message.. from teh same comp
 
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mavsham

Member
Apr 20, 2001
48
0
0
oldman420, thanks you for your reply. but i have already put my hsf on there.. i bought the vantec iceberg as suggesterd by Chopstick217 and cRazYdood and have already installed it.. the problem now is that the nb fan speed is always reported as 0?

did u have the same problem?
 
oldman420

oldman420

Platinum Member
May 22, 2004
2,179
0
0
this is due to no third wire on the fan i wouldnt worry that fan will not fail like the other one did. as long as its spinning you should be fine
 
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