motherboard not giving power to fan

Thread Starter

ardv

Joined Jan 9, 2018
9
Hello,

I have a condor laptop (nomad n14) with this mother board: “hannstar j 94v-0 e89382”, which has the fan stopped working, I get the fan off the motherboard and it worked fine, so I tried to measure the voltage that the motherboard is giving to the fan and I found that it is null (0 v), I searched the net and I found that this may be caused due to bios problem, so I removed the battery and the CMOS battery and clicked on the power button about 15 secs, and then putted the battery again, when I enter F2 options I find that the time has changed (I suppose that the bios is reseted, but the laptop did not take too much time to boot up, I red that it should take some time to boot up after BIOS reset, and the options in the F2 menu does not have bios reset option), but the fan is still not working, I tried to power the fan from the USB output, when I put both 5v and gnd from USB port it does not work, but when I put just the 5V from the USB port and the gnd from the normal fan motherboard connectors the fan works, but the Hard disk stops.

I hope that you can help.
 

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Thread Starter

ardv

Joined Jan 9, 2018
9
Edit:
I tried powering the fan from a phone charger with 5V, when I monitor the CPU voltage with speccy it seems that is good ( average 36°, but when not powering the fan the temperature keep rising until the laptop shutdown), but after few minutes the laptop keep beeping -discontinuous beep- for a while and then the it shuts down. i think that the computer shuts down because it does not have the signal that the fan is working, i tried to wire the 3rd wire of then fan in the motherboard like it was but nothing changes (i think i should also wire the gnd so as the 3rd wire signal works? but the gnd now is with the external charger), or may be this is caused from another thing. the other problem that the fan now is making lot of noise (i think normally the computer regulates the power of the fan regards the temperature).
 
Edit:
I tried powering the fan from a phone charger with 5V, when I monitor the CPU voltage with speccy it seems that is good ( average 36°, but when not powering the fan the temperature keep rising until the laptop shutdown), but after few minutes the laptop keep beeping -discontinuous beep- for a while and then the it shuts down. i think that the computer shuts down because it does not have the signal that the fan is working, i tried to wire the 3rd wire of then fan in the motherboard like it was but nothing changes (i think i should also wire the gnd so as the 3rd wire signal works? but the gnd now is with the external charger), or may be this is caused from another thing. the other problem that the fan now is making lot of noise (i think normally the computer regulates the power of the fan regards the temperature).
maybe the motherboard has a temperature sensor built in. it speeds up when the cpu gets hot. maybe that sensor quit?
 

Ian Rogers

Joined Dec 12, 2012
906
You need to stop putting your fingers into the laptop innards.. If you continue, your laptop will stop completely as connecting devices to different voltage rails isn't the best of ideas...

My laptop has fan control via the keyboard the FN key + the fan symbol turns it off and on.. I also have a boost fan button.

If you need to keep the laptop cool then just get a laptop cooler... Very cheap and the laptop NEVER gets hot enough for the fan to come on..
It will be a lot cheaper if you keep taking chances as you have been doing.
 

Thread Starter

ardv

Joined Jan 9, 2018
9
maybe the motherboard has a temperature sensor built in. it speeds up when the cpu gets hot. maybe that sensor quit?
how to know?

"My laptop has fan control via the keyboard the FN key + the fan symbol turns it off and on.. I also have a boost fan button."
i don't have that.

i will try a laptop cooler and see if the problem is fixed.

this is what i find in a topic that have similar problem:
"If it starts to boot and runs for several minutes, then the beeping starts and the machine shuts down it's most likely a failed cooling fan. Either way this is most likely a hardware issue and the machine will require physical repairs. "

what i think now that the problem will not be fixed with the cooler, because the laptop is shutting down because of the fan problem, so even if the cpu is cool enough but the laptop may still shut down.
 

Ian Rogers

Joined Dec 12, 2012
906
"If it starts to boot and runs for several minutes, then the beeping starts and the machine shuts down it's most likely a failed cooling fan. Either way this is most likely a hardware issue and the machine will require physical repairs. "
Can't believe that!! Laptop fans only come on after intense work load... The fan coming on after a few minutes will drain the battery...
 

Ian Rogers

Joined Dec 12, 2012
906
Laptops shouldn't be called laptops... They overheat ( after quite a bit ) but the laptop mother board tends to warp.. Thus several chips loose several pin connections... They seem to die slowly over several days, each peripheral after another... I have always used them with a breakfast tray so the air can move freely..
 

MeSat

Joined May 16, 2019
16
There is software you can run on your laptop to display sensor readings and fan speeds if they have the tachometer output. Used it on a computer to diagnose a failing water cooler on the CPU.
 

Thread Starter

ardv

Joined Jan 9, 2018
9
Problem Solved!

this program: "SpeedFan" solved it.
when i launch the program and then choose 'automatic fan speed' the fan starts working (i've wired the fan in it's original place in the motherboard), i first tried it several times, and then even when i close the program the fan will still work, i tested the laptop for several hours and it's working well!
i think that the problem was in the BIOS, and when the fan return working again with that program, the BIOS programs deals with the fan normally.
 
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