How to fix System Fan (90B) error on a HP Pavilion G6 Laptop

02 HP Pavilion G6
This article explains how to resolve a System Fan (90B) error from appearing when you start up your HP Pavilion G6 Laptop. The full error reads:

The system detected that a cooling fan is not operating correctly

And looks like this:

HP Pavilion G6 System Fan 90B

HP Pavilion G6 System Fan 90B

The error is caused by the system cooling fan not spinning. Notice I said “Not spinning”. The most likely cause is that the fan is stuck or has fell off its spindle. Rarely are any new parts required for this fix but you will need thermal compound paste as you have to remove the heat sink from the processor.

Service Your Own LaptopIn this example I have used a HP Pavilion G6 but this article is also applicable to many other laptop models as well as the CQ series from HP Compaq.

This procedure should take less than one hour. You do risk damaging the fan but it may be all that is required. More likely you are going to have to take the laptop apart which is described as follows:

 

Remove battery

Remove battery

Remove memory and memory compartment cover

Remove memory and memory compartment cover

Disconnect hard drive and remove

Disconnect hard drive and remove

Undo screw that secures DVD writer. This makes opening the case easier later

Undo screw that secures DVD writer. This makes opening the case easier later

Remove DVD drive. Careful so that plastic does not break on DVD drawer

Remove DVD drive. Careful so that plastic does not break on DVD drawer

Pull both cables off wifi card and undo screw. Remove WiFi card

Pull both cables off wifi card and undo screw. Remove WiFi card

Undo all remaining screws on base of laptop

Undo all remaining screws on base of laptop

Turn laptop over and remove keyboard. The arrows point to small clips that hold in keyboard which need pushing back

Turn laptop over and remove keyboard. The arrows point to small clips that hold in keyboard which need pushing back

Undo screws and release ribbon cables

Undo screws and release ribbon cables

Undo circled screw and disconnect power cable (top right) and other ribbon cables

Undo circled screw and disconnect power cable (top right) and other ribbon cables

Remove motherboard from laptop case

Remove motherboard from laptop case

Fan is top right of motherboard. Here you can see there is dust. This dust will not be causing the problem though

Fan is top right of motherboard. Here you can see there is dust. This dust will not be causing the problem though

Turn motherboard over and undo 4 screws that are holding the heat sink and fan to the CPU

Turn motherboard over and undo 4 screws that are holding the heat sink and fan to the CPU

Clean thermal paste from heat sink and CPU using paper towel and cleaning solution. Undo two screws to open up fan

Clean thermal paste from heat sink and CPU using paper towel and cleaning solution. Undo two screws to open up fan

Here we can see the build up of dust that stopped the fan from spinning

Here we can see the build up of dust that stopped the fan from spinning

Clean out all dust using a vacuum cleaner and paint brush. Apply thermal paste to CPU and reassemble in reverse.

Clean out all dust using a vacuum cleaner and paint brush. Apply thermal paste to CPU and reassemble in reverse.

All original photos are here please feel free to use them as you wish.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


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How to fix System Fan (90B) error on a HP Pavilion G6 Laptop — 6 Comments

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