[RESOLVED] Dell fan running loud

J

jonny b

Computer Doctor
#1
This is a Dell D630 with a 2.6ghz, 3 gb of ram and XP Pro. The fan starts out loud then gets quiet. The computer can work all day without this loud fan noise, all day. As soon as I restart or when 1st turned on the fan runs for maybe 5 minutes loudy. When the fan quiets down it stays quiet. It only gets loud when restarted and 1st turn on. It does not make a bearing noise just a blowing noise like some some older Toshiba's do. So it does not sound like the fan has a problem just that the computer runs it on startup or restart.

It is absolutely clean inside. What can this be?
When I first got the computer the heat sink vanes in the back had a dent in three vanes but I straighten them up with a tiny screwdriver so the air is clearing these vanes perfectly. I have opened up the keyboard and heatsink area and blew out all dust. It seem to be clean in this whole general area.

Any ideas?
 
J

jonny b

Computer Doctor
#3
It only happens on startup or restart then it can be on all day and be a quiet fan is what is so strange. Like yesterday it was left on all day and the fan was mildly quiet. If I had restarted it at the end of the day the fan would cycle loudly for 5 minutes again. I have had over 40 of these units and this is the only one that does this.
 
M

Martin_89

Active Member
#4
all Dells do this however only for around 2-3 seconds on a fresh boot. sounds like its an issue with the motherboards temp sensor that controls the fan speed?
 
J

jonny b

Computer Doctor
#5
Look. When I start the computer in the morning it does it. No problem with heat here. If I leave the computer on all day it gets warm a bit like my other D630. If I decided to restart it while warm then it does the same thing, 5 min of fan blowing loudly and then a silent whirl for the rest of the day. So it can't be related to heat, don't you agree.

I have four of these D630s and a D620 and none of them do this except for this one. I have opened it and checked out for any dust. Used a compressor and an air can. No dust whatsoever is in this machine.

Any thoughts?
 
Shinma

Shinma

____________
#6
As Martin_89 already pointed out,
Many laptops have fans revving at high rpms at cold boot and at restarts then idles after a little while.
The only thing out of the ordinary in this case, is the duration: five minutes, which sounds a bit long.
Since it is in the design, not aware of any workaround.
 
J

jonny b

Computer Doctor
#7
I have bought and sold over 40 D630 and D620s and none of them done this.
 
Shinma

Shinma

____________
#8
Since you're sure about the long duration and there are no configurable setting in the CMOS/BIOS menu,
Still not aware of any workaround since problem likely due to mobo itself.
Mobo replacement.
 

Associates