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fans not working


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#1
AnthonyJ

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hello. my board has 3 3pin jacks for fans, 1 cpu, 1 case, 1 front. now it was working before i shut down my pc. now i cant get them to work other than cpu. any guesses?
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#2
Jack123

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01-AnthonyJ-[Fan not working]-25th MAR-2007

hello. my board has 3 3pin jacks for fans, 1 cpu, 1 case, 1 front. now it was working before i shut down my pc. now i cant get them to work other than cpu. any guesses?


Assuming, from some of your earlier threads on fans, that these are new fans -

Here are a couple of ideas – for causes

1. Check your BIOS Settings – There may be some settings under something like – Hardware Monitor – for – Disable/Enable – Start Temp setting – Speed Ratio – Speed Up/Down Response Time –
2. Also check BIOS Settings under – Power Management – ACPI – or APM -??
3. Check – Control Panel – for Power Options/Management Folder – or – Performance & Maintenance also check for – User Name – may have different/conflicting settings for different user or environment settings??
4. You may be in or using Standby Power – and the Voltage is lower & not developing enough starting torque – (similar, but different then next item) –
5. Depends on the size & starting torque of the fan – The output of the motherboard for the fan will be starting at low speed value – And the fans may not always start at this voltage?? You can manually try to give a slight push – just do not jam up –(This is done just to test for this condition-only) I give a cure for this later -
6. You have some other fan speed controller that either needs to be disabled or disconnected –
7. Ambient temperature is lower than start temperature of motherboard setting – Most of the times this is a factory set value with no user control – CPU fan will always run –
8. Check Fan connectors – they may not be secured properly
9. Check fan wiring – may have wire pinched under housing during installation – or has been caught on sharp corner ??
10. Do the fans have a switch for speed – sometimes these are slide switches & may be set in – No man’s Land – meaning an open position/ not seated properly?? Or the switch has an external position??
11. Fan just seized up – Kaput!

I am betting on #5 – (Probably overloading the motherboard fan control circuit)

The cure – remove the front fan from motherboard – Then connect to its own Peripheral Power Connector & let this fan run at full speed at all times – This should increase the motherboard fan starting power for so that the case fan will now start – It is better to have the case fan, which usually installed on/in the side panel, to run slower, in order to keep the air turbulence at a minimum – Many times this side fan is ineffective because of the air turbulence that it may cause – Just having Air louvers – cut in the side panel – to allow cooler air to enter is better in most cases – The Rear Exhaust Fan/s Speed is/are the critical speed – not the intake – The reason I said to increase the front fan – Is because that would usually be blowing air across the hard drives – And there is very little space for air to travel – and you do not want the hot air to build up –

Jack123

Edited by Jack123, 25 March 2007 - 03:53 PM.

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#3
AnthonyJ

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01-AnthonyJ-[Fan not working]-25th MAR-2007

hello. my board has 3 3pin jacks for fans, 1 cpu, 1 case, 1 front. now it was working before i shut down my pc. now i cant get them to work other than cpu. any guesses?


Assuming, from some of your earlier threads on fans, that these are new fans -

Here are a couple of ideas – for causes

1. Check your BIOS Settings – There may be some settings under something like – Hardware Monitor – for – Disable/Enable – Start Temp setting – Speed Ratio – Speed Up/Down Response Time –
2. Also check BIOS Settings under – Power Management – ACPI – or APM -??
3. Check – Control Panel – for Power Options/Management Folder – or – Performance & Maintenance also check for – User Name – may have different/conflicting settings for different user or environment settings??
4. You may be in or using Standby Power – and the Voltage is lower & not developing enough starting torque – (similar, but different then next item) –
5. Depends on the size & starting torque of the fan – The output of the motherboard for the fan will be starting at low speed value – And the fans may not always start at this voltage?? You can manually try to give a slight push – just do not jam up –(This is done just to test for this condition-only) I give a cure for this later -
6. You have some other fan speed controller that either needs to be disabled or disconnected –
7. Ambient temperature is lower than start temperature of motherboard setting – Most of the times this is a factory set value with no user control – CPU fan will always run –
8. Check Fan connectors – they may not be secured properly
9. Check fan wiring – may have wire pinched under housing during installation – or has been caught on sharp corner ??
10. Do the fans have a switch for speed – sometimes these are slide switches & may be set in – No man’s Land – meaning an open position/ not seated properly?? Or the switch has an external position??
11. Fan just seized up – Kaput!

I am betting on #5 – (Probably overloading the motherboard fan control circuit)

The cure – remove the front fan from motherboard – Then connect to its own Peripheral Power Connector & let this fan run at full speed at all times – This should increase the motherboard fan starting power for so that the case fan will now start – It is better to have the case fan, which usually installed on/in the side panel, to run slower, in order to keep the air turbulence at a minimum – Many times this side fan is ineffective because of the air turbulence that it may cause – Just having Air louvers – cut in the side panel – to allow cooler air to enter is better in most cases – The Rear Exhaust Fan/s Speed is/are the critical speed – not the intake – The reason I said to increase the front fan – Is because that would usually be blowing air across the hard drives – And there is very little space for air to travel – and you do not want the hot air to build up –

Jack123

these are the fans i have had, and they still work when connected to a power source just not from the mobo. also i have no fan controllers yet :/
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