Yes, the fan, if plugged into the headers
on the Motherboard, should be spinning. Even PWM controlled fans spin
unless you manually disable them.
What kind of Laptop do you
have? Usually, there's more than 1 fan header in Desktop Motherboard and
You can always plug in the fan into a different fan header on the
Motherboard to test the fan. but on Laptop motherboard there is only
one header socket.
The one that is
labeled CPU fan is to monitor and control it through the bios. If you
fan isn't spinning when you boot up your Laptop, go into the bios,
manually override the fan setting to spin at 100% all the time. If it
doesn't spin, then there's a problem. Either your fan or the fan
controller PWM circuit on the motherboard.
basically CPU fan has three to four pin connector/jack and different color wire.
fan connector placement is shown in the figures below:
| Pin # | Signal Function | Wire Color |
| 1 | CPU Fan PWM | Green |
| 2 | CPU Fan In | Yellow |
| 3 | CPU Fan Power | Red |
| 4 | Ground | Black |
| Pin | Name | Color |
|---|---|---|
| 1 | GND | black |
| 2 | +5VDC | yellow |
| 3 | Sense | green |
| 4 | Control | blue |
CPU
fans may use it 3-pin or 4-pin power connectors. 3-pin connectors are
usually used for the smaller fans with lower power consumption and
4-pin connectors are usually used by CPU fans with higher power
consumption. Fans and on-board fan headers are backwards compatible.
if now your fan not spinning even if it is proper plugged in on laptop motherboard, and your bios is fine
then
first of all you should have to check fan with a 5v battery or you can
use little high voltage battery like 9v but at this time don't connect
fan with battery for a long time, that can damage fan.
to
check a CPU fan with a battery just leave sensor pin free(no connected)
and connect it's positive terminal with battery +ve point and GUN pin
of fan connect with -ve of battery shown in the figures below if Fan
start spinning that means CPU fan is ok now the problem has in your
laptops motherboard
checking Laptop CPU Cooling Fan using a external battery
