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7910
August 13th, 2018 14:00
Inspiron 3847, bios fan error on boot
I have an old Inspiron 3847 , the only thing original in this computer is the motherboard and the cpu everything else as been changed or upgrade , it works properly but each time I boot the bios gives me a fan error and ask me confirm by pressing F1 and that's kinda of annoying. I can't connect the fans because they are connected to a nzxt device that sync my fan speed so that i can control the noise level, is there any possible way to prevent that error message ?
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RoHe
10 Elder
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45.2K Posts
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August 13th, 2018 16:00
BIOS looks for a sensor that's inside Dell's OEM CPU fans. It can't see that sensor if the fan isn't plugged directly into the motherboard's fan connector. So you will get the error message every time because BIOS concludes the fan's sensor failed.
agent boubou
1 Rookie
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2 Posts
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August 14th, 2018 14:00
so there is no way I can get rid of this error ?
RoHe
10 Elder
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45.2K Posts
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August 14th, 2018 14:00
I thought about that too, except the manual implies the CPU fan and heat sink are a single unit. So it would be hard to safely toss all that extra stuff inside the case.
It might be possible to detach the OEM CPU fan from the heat sink and find a place to mount that fan inside the case where it can be plugged into the motherboard but can't promise, and would be done entirely at user's own risk. And how much noise that extra fan might cause in this setup, who knows...?
Tesla1856
8 Wizard
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17.1K Posts
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August 14th, 2018 14:00
How about ... connect proper Dell fan and toss it inside the case ? :Smile:
Just another example of why OEM motherboards don't transfer or run so good in after-market cases.
speedstep
9 Legend
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47K Posts
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August 18th, 2018 08:00
Dell fans do not use standard wiring. This is what causes the error. When you attach a standard fan to a dell header it often destroys the fan. Same with vice versa with dell fan on standard header. Pay close attention to the wire colors.
Dell does not use standard wiring or Pinouts on their fan headers.
For 3 wire they reverse 12v and tach.
Black Red White not
Black White Red
DELL 3 PIN
This can lead to self destruction for a dell fan on standard motherboard or the other way round.
https://www.amazon.com/Dedicated-Adapter-Conversion-Cable-Dell/dp/B07F7CTMVZ
https://www.walmart.com/ip/48729225
This is the CPU FAN for Example.
https://www.amazon.com/Dell-Optiplex-Processor-Aluminum-Heatsink/dp/B079YVX6HC
Dell MB
Pin Number
Function
Dell wire color
Pin #
INTEL Fan wire color
Description
1
Sens (TACH)
White/Yellow
3
Green
Sens (TACH)
2
+12v
Red
2
Yellow
+12v
3
Gnd
Black
1
Black
Gnd
4
PWM
Blue
4
Blue
PWM
5
Key
unused
DELL FAN WIRING
mrserious28
1 Message
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November 28th, 2018 09:00
Thank you so much! This was very helpful! I had the exact same problem and this solved it perfectly!
I used your dell fan connection pin-out diagram to connect my fan's RPM sensor to the Dell fan connectors RPM sensor (yellow wire/white in diagram), and my error messages are gone! YEY! Now my computer doesn't halt on boot!