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laptop fan gets off after spining for 1 sec of boot

computer hardware fan doesnt run after boot

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#1
priyamkar

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recently i opened my laptop for cleaning purpose , after cleaning when i reassmbled the laptop i could see that the fan rotates for a split second when i press the power button but then goes off and does not run at all. the laptop boots smoothly but gets off due to over heating after10-15 minutes.  can any one please suggest whats the problem and how to get through it.

btw my laptop model is

acer aspire 5745G 


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#2
phillpower2

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:welcome:   priyamkar,

 

when i reassmbled the laptop i could see that the fan rotates for a split second when i press the power button but then goes off and does not run at all. the laptop boots smoothly but gets off due to over heating after10-15 minutes

 

 

Cooling fan failure or a loose cooling fan power supply are two things that would cause such behaviour, would strongly advise that for now you do not power up the notebook  as you risk frying the CPU.

 

Was the cooling fan and heatsink assembly removed as part of the cleaning.


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#3
priyamkar

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Was the cooling fan and heatsink assembly removed as part of the cleaning.

 

yes i removed the cooling fan and the heat sink assembly, but yes did not apply any thermal paste freshly, is it causing any affect ?

Edited by priyamkar, 09 May 2018 - 01:44 PM.

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#4
phillpower2

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If the heatsink was removed the old thermal compound has to be properly cleaned off using an an appropriate cleaner such as 99% pure alcohol and a fresh amount of thermal compound then correctly reapplied, not doing so would not explain why the fan is stopping spinning but it would explain the notebook shutting down at some point due to the CPU overheating, this would still happen even if the cooling fan was spinning.

 

is it causing any affect ?

 

 

It is frying your processor and if not corrected the CPU will burn up.


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#5
priyamkar

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i can completely understand the cosequences of running the laptop without apllying the thermal compund freshly.

i am not going to turn it on before apllying thermal paste but even then, if the fan just gets on for a split second only, the cpu is gonna heated up significantly and will end up shuting down the system as happening righ now, right!

 

so what would be your sugestion for me to troubleshoot the entire situation


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#6
phillpower2

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so what would be your sugestion for me to troubleshoot the entire situation

 

 

Has the notebook been fully reassembled.


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#7
priyamkar

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Has the notebook been fully reassembled.

 

yes it is fully reassembled


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#8
phillpower2

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It is going to have to be disassembled to sort out the thermal compound in any event but was hoping that you would be able to quickly check that the CPU fan was securely connected to the power header on the motherboard.

 

Once you have dismantled the notebook you should test the fan, do you have or can you obtain a spare USB cable that is no longer needed, if yes, see the video here for how to test the fan using a USB cable.


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#9
priyamkar

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i have to dismentle completely to reach to the cpu fan jack... so i m thinking to aplly the thermal cpmpound and test the fan altogether 

 

i will do it first and let you know the situation pretty soon, thanks! :yes:


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#10
phillpower2

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Yes, that would be the correct approach  :thumbsup:

 

I use Arctic Silver thermal compounds but there are other brands of the same good quality, some info for you at the link here


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#11
ahs89

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It could be possible CPU fan/thermal paste issue because of which your system is getting overheated and results in unusual behaviour.


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#12
phillpower2

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Not heard back from you priyamkar, do you still require assistance or is the issue now resolved, an update would be appreciated.


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