Question Laptop fan will not start spinning

geo_5_

Commendable
Apr 19, 2017
9
0
1,510
0
Hello.

I recently had to reflow my laptop gpu to get it back to being functional. The reflow worked and I then started reassempling the laptop. Everything worked fine but I noticed I forgot to put back a component. So I had to take it apart again. After I reassembled it together I noticed the fan didn't spin. I got no error during post and booted windows.

Things I have tried :

Checking any loose cables.
Checked with bios l. (even did default setting and a hard reset cmos battery)

Checked with speedfan: I get 3000+ rpm and some other time I got 1000+. Though the fan doesn't spin a bit. I think these are false readings.

I changed power settings to default.
I even started a game to see if the fan started then, but nothing.

Finally I replaced the fan with a new one but still the same issue.

Strange thing is that I don't get a single warning /error, not even during post.

Thanks in advance.
 

geo_5_

Commendable
Apr 19, 2017
9
0
1,510
0
Hi thanks for the reply.

After the reflowing process it was working normally. I think I short circuited it because when I started plugging in things I forgot the power on and touched it with my bear hands. Can I tell with a polymeter?
 

geo_5_

Commendable
Apr 19, 2017
9
0
1,510
0
Tried both but none managed to make the fan spin. Also the motherboard doesn't seem to be toasted or something around the fan.
 
Did you reapply thermal paste before mounting the heat sink?

Check the connector of the fan, resolder the pins
check the voltage of the pins if possible with a multimeter
check if the fan can spin freely

How hot is the laptop getting? Use coretemp to have a look
 

geo_5_

Commendable
Apr 19, 2017
9
0
1,510
0
Yes, I reapply thermal paste every time I attempt a fix. The fan works normally to another laptop I tried.

I will check with a multimeter and report back.

I'm really grateful to you for your help.
 
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