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Phil, Non-Squid
Guest
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 Posted: Sat May 19, 2007 3:04 am Post subject: CPU fan not getting enough voltage to spin up? (965P-DS3) |
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Okay so this is a weird one. I have a 965P-DS3 and a Thermaltake Big
Typhoon (old one) with a 3-pin connector. When the computer turns on, the
HDs spin up, and then voltage is supplied to the fans and I guess the mobo
in general. The fan gives a little jump, but then stops short of overcoming
that first "bump" of the motor, so the fan doesn't turn unless I stick
something in and give the blades a little push.
When it's spinning, the fan on the Big Typhoon spins at a reported ~800 rpms
in the PC Health of the BIOS. I'm fairly certain that the fan is supposed
to spin at 1200 rpms. I remember connecting the fan to a SLA 12V battery
for my motorcycle and seeing it have no problems spin up and move air
effectively.
My BIOS settings for fan control and QST are all on "disable" so they should
all be running at full speed. My Antec Tricool on low is spinning up just
fine on the chassis fan header.
I've tried clearing the BIOS and trying different QST/Legacy/Disabled modes
and none of them change anything. The CPU fan still refuses to spin up and
the alarm lets me know. I have to stick something into the fan blades to
get them going.
The motor is not that old and has been recently shot up with WD40 in hopes
of freeing something gummy up.
What leads me to believe that there's insufficient voltage is the fact that
the fan spun up with a true 12V (more like 13.8V) voltage supply from the
motorcycle battery. I'm going to take out the multimeter to figure this one
out further soon. If voltage isn't the problem, I'll have to go back to the
stock Intel fan.
Anyone experienced this problem?
--
Phil |
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Fred
Guest
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| Posted: Sat May 19, 2007 3:41 am Post subject: Re: CPU fan not getting enough voltage to spin up? (965P-DS3 |
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On Fri, 18 May 2007 18:04:21 -0400, "Phil, Non-Squid"
<notsure@iwanttogiveyou.this> wrote:
| Quote: | Okay so this is a weird one. I have a 965P-DS3 and a Thermaltake Big
Typhoon (old one) with a 3-pin connector. When the computer turns on, the
HDs spin up, and then voltage is supplied to the fans and I guess the mobo
in general. The fan gives a little jump, but then stops short of overcoming
that first "bump" of the motor, so the fan doesn't turn unless I stick
something in and give the blades a little push.
When it's spinning, the fan on the Big Typhoon spins at a reported ~800 rpms
in the PC Health of the BIOS. I'm fairly certain that the fan is supposed
to spin at 1200 rpms. I remember connecting the fan to a SLA 12V battery
for my motorcycle and seeing it have no problems spin up and move air
effectively.
My BIOS settings for fan control and QST are all on "disable" so they should
all be running at full speed. My Antec Tricool on low is spinning up just
fine on the chassis fan header.
I've tried clearing the BIOS and trying different QST/Legacy/Disabled modes
and none of them change anything. The CPU fan still refuses to spin up and
the alarm lets me know. I have to stick something into the fan blades to
get them going.
The motor is not that old and has been recently shot up with WD40 in hopes
of freeing something gummy up.
What leads me to believe that there's insufficient voltage is the fact that
the fan spun up with a true 12V (more like 13.8V) voltage supply from the
motorcycle battery. I'm going to take out the multimeter to figure this one
out further soon. If voltage isn't the problem, I'll have to go back to the
stock Intel fan.
Anyone experienced this problem?
|
On my 965G-DS3, if the fan speed and mode are set to 'auto' the
motherboard will pulse-width modulate the fan speed (assuming the
fan has a 4-pin connector attached to the motherboard). At first the
CPU is not hot enough to require any fan at all and the fan just jumps
a little but doesn't start spinning. After a minute or so the fan
will start turning but it's at a slow enough rate to be completely
silent. Supposedly if you disable fan speed and mode it SHOULD
run at full speed all the time with no pulse width modulation but I
haven't tried this setting. The behavior you describe with the 'bump'
sounds like it's using PWM and the CPU is not hot enough yet to run
the fan. Maybe let it run for a few minutes and see if it starts
spinning. |
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Phil, Non-Squid
Guest
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| Posted: Sat May 19, 2007 7:23 am Post subject: Re: CPU fan not getting enough voltage to spin up? (965P-DS3 |
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Fred wrote:
| Quote: | On Fri, 18 May 2007 18:04:21 -0400, "Phil, Non-Squid"
notsure@iwanttogiveyou.this> wrote:
Okay so this is a weird one. I have a 965P-DS3 and a Thermaltake Big
Typhoon (old one) with a 3-pin connector. When the computer turns
on, the HDs spin up, and then voltage is supplied to the fans and I
guess the mobo in general. The fan gives a little jump, but then
stops short of overcoming that first "bump" of the motor, so the fan
doesn't turn unless I stick something in and give the blades a little
push.
When it's spinning, the fan on the Big Typhoon spins at a reported
~800 rpms in the PC Health of the BIOS. I'm fairly certain that the
fan is supposed to spin at 1200 rpms. I remember connecting the fan
to a SLA 12V battery for my motorcycle and seeing it have no problems
spin up and move air effectively.
My BIOS settings for fan control and QST are all on "disable" so they
should all be running at full speed. My Antec Tricool on low is
spinning up just fine on the chassis fan header.
I've tried clearing the BIOS and trying different QST/Legacy/Disabled
modes and none of them change anything. The CPU fan still refuses to
spin up and the alarm lets me know. I have to stick something into
the fan blades to get them going.
The motor is not that old and has been recently shot up with WD40 in
hopes of freeing something gummy up.
What leads me to believe that there's insufficient voltage is the
fact that the fan spun up with a true 12V (more like 13.8V) voltage
supply from the motorcycle battery. I'm going to take out the
multimeter to figure this one out further soon. If voltage isn't the
problem, I'll have to go back to the stock Intel fan.
Anyone experienced this problem?
On my 965G-DS3, if the fan speed and mode are set to 'auto' the
motherboard will pulse-width modulate the fan speed (assuming the
fan has a 4-pin connector attached to the motherboard). At first the
CPU is not hot enough to require any fan at all and the fan just jumps
a little but doesn't start spinning. After a minute or so the fan
will start turning but it's at a slow enough rate to be completely
silent. Supposedly if you disable fan speed and mode it SHOULD
run at full speed all the time with no pulse width modulation but I
haven't tried this setting. The behavior you describe with the 'bump'
sounds like it's using PWM and the CPU is not hot enough yet to run
the fan. Maybe let it run for a few minutes and see if it starts
spinning.
|
The bump I'm describing is what fans do when a slight voltage is applied.
Think about it. I'm not sure how much you know about DC motors, but for the
purpose of this discussion, I'll assume a worst-case scenario. Here's some
info on how it works.
When voltage is applied, the magnetic field pulls the permanent magnet
towards the lowest energy position before the commutator flips everything
around for the next phase. Thus, the fan is in a different "low energy
position" when the fan is off, but when the low voltage is applied, the
magnetic field tends to change the position of the fan slightly, but not
enough to get it over that first "hump" and have it continuing to run.
What it does when the fan doesn't spin up is that the computer assumes that
the fan is broken or not connected. As a result, it shuts down the computer
after about 10 seconds of being on and relaxes memory timings or cuts off
manual FSB control and then restarts hoping it'll work. It will go on and
off until it's red in the face. No progress. I really need to whip out the
multimeter and test those fan header leads for voltage...
--
Phil |
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lkboop
Guest
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| Posted: Sun May 20, 2007 2:53 am Post subject: Re: CPU fan not getting enough voltage to spin up? (965P-DS3 |
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Phil, Non-Squid wrote:
| Quote: | Okay so this is a weird one. I have a 965P-DS3 and a Thermaltake Big
Typhoon (old one) with a 3-pin connector. When the computer turns on, the
HDs spin up, and then voltage is supplied to the fans and I guess the mobo
in general. The fan gives a little jump, but then stops short of overcoming
that first "bump" of the motor, so the fan doesn't turn unless I stick
something in and give the blades a little push.
When it's spinning, the fan on the Big Typhoon spins at a reported ~800 rpms
in the PC Health of the BIOS. I'm fairly certain that the fan is supposed
to spin at 1200 rpms. I remember connecting the fan to a SLA 12V battery
for my motorcycle and seeing it have no problems spin up and move air
effectively.
My BIOS settings for fan control and QST are all on "disable" so they should
all be running at full speed. My Antec Tricool on low is spinning up just
fine on the chassis fan header.
I've tried clearing the BIOS and trying different QST/Legacy/Disabled modes
and none of them change anything. The CPU fan still refuses to spin up and
the alarm lets me know. I have to stick something into the fan blades to
get them going.
The motor is not that old and has been recently shot up with WD40 in hopes
of freeing something gummy up.
What leads me to believe that there's insufficient voltage is the fact that
the fan spun up with a true 12V (more like 13.8V) voltage supply from the
motorcycle battery. I'm going to take out the multimeter to figure this one
out further soon. If voltage isn't the problem, I'll have to go back to the
stock Intel fan.
Anyone experienced this problem?
The fan is going bad. It's just like any other electric motor. They |
can be forced to turn but the motor has little or no torque to maintain
speed. |
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Phil, Non-Squid
Guest
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| Posted: Sun May 20, 2007 9:51 am Post subject: Re: CPU fan not getting enough voltage to spin up? (965P-DS3 |
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lkboop wrote:
| Quote: | Phil, Non-Squid wrote:
Okay so this is a weird one. I have a 965P-DS3 and a Thermaltake Big
Typhoon (old one) with a 3-pin connector. When the computer turns
on, the HDs spin up, and then voltage is supplied to the fans and I
guess the mobo in general. The fan gives a little jump, but then
stops short of overcoming that first "bump" of the motor, so the fan
doesn't turn unless I stick something in and give the blades a
little push.
When it's spinning, the fan on the Big Typhoon spins at a reported
~800 rpms in the PC Health of the BIOS. I'm fairly certain that the
fan is supposed to spin at 1200 rpms. I remember connecting the fan
to a SLA 12V battery for my motorcycle and seeing it have no
problems spin up and move air effectively.
My BIOS settings for fan control and QST are all on "disable" so
they should all be running at full speed. My Antec Tricool on low
is spinning up just fine on the chassis fan header.
I've tried clearing the BIOS and trying different
QST/Legacy/Disabled modes and none of them change anything. The CPU
fan still refuses to spin up and the alarm lets me know. I have to
stick something into the fan blades to get them going.
The motor is not that old and has been recently shot up with WD40 in
hopes of freeing something gummy up.
What leads me to believe that there's insufficient voltage is the
fact that the fan spun up with a true 12V (more like 13.8V) voltage
supply from the motorcycle battery. I'm going to take out the
multimeter to figure this one out further soon. If voltage isn't
the problem, I'll have to go back to the stock Intel fan.
Anyone experienced this problem?
The fan is going bad. It's just like any other electric motor. They
can be forced to turn but the motor has little or no torque to
maintain speed.
|
I found out the problem. In Legacy, QST, or Auto mode, the computer oddly
delivers 5.03V to the CPU fan continuously, even under Windows. I'm
guessing it's not PWM'ed because I saw what the PWMed function under QST is
like. Under "disable" the fan is initially delivered 5V, and then about 4
secs after the computer is first pushed on, the full 12V is delivered. I'm
getting the full 1200 rpms now instead of 775. Now I have to figure out how
to stop the computer from thinking the fan isn't coming on. It may be as
simple as disabling CPU fan speed monitoring. The comp will shut itself
down if it gets to >85C, right?
I just discovered by playing with Advanced options in Speedfan that I now
have software control over my fans!!! For some reason the PWM mode on the
Speedfan program was set on "on/off" instead of software controlled. This
is perfect! More updates soon, if you care to find out.
--
Phil |
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Phil, Non-Squid
Guest
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| Posted: Sun May 20, 2007 9:56 pm Post subject: Re: CPU fan not getting enough voltage to spin up? (965P-DS3 |
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"Phil, Non-Squid" <notsure@iwanttogiveyou.this> wrote in message
news:464fd3f5$0$9930$4c368faf@roadrunner.com...
| Quote: | lkboop wrote:
Phil, Non-Squid wrote:
Okay so this is a weird one. I have a 965P-DS3 and a Thermaltake Big
Typhoon (old one) with a 3-pin connector. When the computer turns
on, the HDs spin up, and then voltage is supplied to the fans and I
guess the mobo in general. The fan gives a little jump, but then
stops short of overcoming that first "bump" of the motor, so the fan
doesn't turn unless I stick something in and give the blades a
little push.
When it's spinning, the fan on the Big Typhoon spins at a reported
~800 rpms in the PC Health of the BIOS. I'm fairly certain that the
fan is supposed to spin at 1200 rpms. I remember connecting the fan
to a SLA 12V battery for my motorcycle and seeing it have no
problems spin up and move air effectively.
My BIOS settings for fan control and QST are all on "disable" so
they should all be running at full speed. My Antec Tricool on low
is spinning up just fine on the chassis fan header.
I've tried clearing the BIOS and trying different
QST/Legacy/Disabled modes and none of them change anything. The CPU
fan still refuses to spin up and the alarm lets me know. I have to
stick something into the fan blades to get them going.
The motor is not that old and has been recently shot up with WD40 in
hopes of freeing something gummy up.
What leads me to believe that there's insufficient voltage is the
fact that the fan spun up with a true 12V (more like 13.8V) voltage
supply from the motorcycle battery. I'm going to take out the
multimeter to figure this one out further soon. If voltage isn't
the problem, I'll have to go back to the stock Intel fan.
Anyone experienced this problem?
The fan is going bad. It's just like any other electric motor. They
can be forced to turn but the motor has little or no torque to
maintain speed.
I found out the problem. In Legacy, QST, or Auto mode, the computer oddly
delivers 5.03V to the CPU fan continuously, even under Windows. I'm
guessing it's not PWM'ed because I saw what the PWMed function under QST
is like. Under "disable" the fan is initially delivered 5V, and then
about 4 secs after the computer is first pushed on, the full 12V is
delivered. I'm getting the full 1200 rpms now instead of 775. Now I have
to figure out how to stop the computer from thinking the fan isn't coming
on. It may be as simple as disabling CPU fan speed monitoring. The comp
will shut itself down if it gets to >85C, right?
I just discovered by playing with Advanced options in Speedfan that I now
have software control over my fans!!! For some reason the PWM mode on the
Speedfan program was set on "on/off" instead of software controlled. This
is perfect! More updates soon, if you care to find out.
|
When the fan control stopped working at 70% and below for the case fan, I
was trying to diagnose when I ended up accidentally shorting the case fan
leads and now that one's dead. Comp still works fine, but I'm out a mobo
fan lead and have to use a flipped Molex again.
--
Phil |
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