Cpu Fan Starts Then Stops Then Starts Again and Repeats

1. 2013/03/15

   

   dnmacleod Well-Known Fellow member Thread Starter

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   Hi guys.

   I've got an Acer Aspire 5332 laptop in for repair. The symptoms are that later pressing the power push button, the fan spins for nearly 3 secs and then stops. The Os continues to load and the laptop runs OK for a while simply so shuts down due to overheating.

   Thinking information technology was the fan itself, I got a replacement fan and swapped it out. No change. The laptop otherwise runs fine but shuts downwardly when it overheats. I don't see annihilation to forcefulness the fan to run continuously or suit it in whatever way.

   I affair I did find when disassembling it was that 2 of the screws between the hinges had damaged sockets indicating that it had some impact on its edge in the past. Maybe this damaged the motherboard?

   Whatever other suggestions?

2. 2013/03/xvi

   

   retiredlearner SuperGeek WindowsBBS Squad Member

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   Hello, have you diddled through the laptop to make sure vents are clear?

   Y'all may accept to renew the Thermal compound between the CPU and the rut sink. Neil.

4. 2013/03/16

   

   dnmacleod Well-Known Fellow member Thread Starter

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   Hi Neil. Yes I had the laptop fully stripped down to the concluding screw.

   All the vents are spotless. Why would replacing the thermal chemical compound make this sort of difference? Is there a sensor that would be affected by that?

5. 2013/03/16

   

   Arie Administrator Administrator Staff

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   Every bit you, I would doubtable concrete damage. Not much you can do about that, besides replacing the system lath.

6. 2013/03/sixteen

   

   TonyT SuperGeek Staff

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   Yes, there's a temp sensor. When temp gets to a certain level the comp will shut off. That level can usually be set in the bios. Thermal compound helps displace heat, and if failing the comp volition shut off.

   Just more likely the solution is supersede motherboard.

7. 2013/03/xvi

   

   dnmacleod Well-Known Member Thread Starter

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   Howdy Tony. That'due south presumably why its shutting down subsequently almost 10 mins or so. I suspect that if the fan turned at all it would cool it sufficiently to run for a bit longer. I did try using an air tin to blow air through the vent and that did help information technology to run a bit longer, but it so shut down after a while anyway.

   It looks like the consensus is looking towards the motherboard.

8. 2013/03/16

   

   Bill SuperGeek WindowsBBS Team Fellow member

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   It shouldn't. TIM (thermal interface textile) does not "go bad ", dry out out, vesture out, get erstwhile or need regular replacing Equally LONG As the cured bond betwixt the mating surfaces is never broken. The exposed edges may dry out and go a little crusty, but the TIM between the mating surfaces will remain viable for x+ years or more than - if not undisturbed.

   If the estimator has never been bounced off the floor, the heatsink never removed or otherwise disturbed enough to pause the cured bail, and the heatsink mounting machinery is still properly attached, you lot don't need to supplant the TIM.

   Y'all MUST withal, always thoroughly clean the mating surfaces and supervene upon the TIM whenever you disturb or remove the heatsink in one case is has cured (and note the curing process starts the very first fourth dimension heat is applied).

   Did you remove the CPU's heatsink? If you did, did you thoroughly make clean the surfaces and utilize a fresh new, and proper (thin as possible but still complete coverage) layer of TIM?

   The most efficient transfer of heat occurs ONLY WITH direct metal to metal contact. The sole purpose of TIM is to displace any insulating air trapped in the microscopic pits and valleys of the mating surfaces. Whatever excess TIM is in the manner of straight metallic to metal contact and therefore counterproductive to the most efficient transfer of heat.

   The CPU'due south sensor is located on the die (inside the CPU housing) then there is no manner information technology can be affected by TIM.

   I concur with Tony and suggest you look in the BIOS Setup Menu for threshold temperatures and perhaps fan control settings. Something may be off there.

   Alternatively, y'all may demand to "Mickey Mouse" this a chip and power the fan directly from a power source instead of the fan controller - if the system allows it (some systems will shut down if no fan is detected even if not hot).

9. 2013/03/16

   

   dnmacleod Well-Known Member Thread Starter

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   Hi BillThat's the thing Bill. It has clearly had an bear on on the border betwixt the hinges equally 2 of the screw sockets were damaged, but, assuming that this impact damaged the TIM seal, would the dissentious of the TIM seal cause the fan to stop; bearing in mind that it stops subsequently a few seconds earlier windows fifty-fifty starts loading?No - its non necessary to remove the heatsink to change the fan on this model.
   I idea of that and, no, there are no fan settings in the BIOS.

   As for an external power source, I don't take a suitable one and going downwardly that road volition chop-chop brand the repair toll more the laptop is worth to be honest.

10. 2013/03/16

    

    Beak SuperGeek WindowsBBS Squad Fellow member

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    If the bond has been broken, air has gotten between the mating surfaces, reducing the effectiveness of the heat transfer. When you offset kicking, the CPU is non hot, but it tin can merely take a few a 2nd or ii for the internal CPU heat to exceed "normal ". So yep, if the bond is broken that could cause this symptom.

    If in doubt, I would replace the TIM.

    That'due south fine as long equally the bail was not cleaved when replacing the fan. It may not say "Fan ". Instead it may exist somewhat cryptic and talk about thermal protection, RPMs, temperature thresholds.

    I did not mean external to the estimator, only, but rather directly continued to a +12 (or +5 depending on fan spec) voltage indicate elsewhere inside the estimator. If more than one fan, perchance where the other gets power. Simply that'south assuming some wayward setting is causing the fan to end and not something else.

    Whatever just for the record, are y'all certain the fan stops spinning? Or could information technology just be slowing downward to a bespeak you lot cannot hear it spin?

11. 2013/03/27

    

    dnmacleod Well-Known Member Thread Starter

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    Since the customer isn't wishing to spend any more money on this laptop, its as well to shut this thread.

12. 2013/03/28

    

    TonyT SuperGeek Staff

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    Yep. Even if it'southward a 12v fan, you can remove the fan and rig ii wires connected to a 6v or 9v battery to test the fan. A battery volition spin a fan without damaging the fan.

13. 2013/03/28

    

    dnmacleod Well-Known Member Thread Starter

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    By the fashion, the fan was brand new and did spin upwards and then must take got the required voltage to do then. It so stopped completely. I did watch it through the grille and it nearly definitely did terminate.

    The likelihood of the new fan exhibiting the exact same symptoms as the old 1 would be remote to say the least.

14. 2013/03/28

    

    Bill SuperGeek WindowsBBS Team Member

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    So it sounds like the PSU is sensing a fault, and shutting down. But at this bespeak there is no way to determine where that error may be, and as noted the customer is no longer concerned.

15. 2013/03/28

    

    dnmacleod Well-Known Member Thread Starter

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    Yes. Given that its a laptop and consequently poke and promise (with no guarantee of a cheap fix) is going to rapidly become prohibitively expensive, he's decided that its improve to telephone call information technology quits and put the money towards a new one.

16. 2013/03/28

    

    Neb SuperGeek WindowsBBS Team Member

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    Well, you might want to suggest he pull the drive and put it into an enclosure or use an adapter connected to another computer and so he can copy off, and then delete any data he does non want to lose, or others to encounter. Then "wipe" the bulldoze, or at least the free space before getting rid of it.

17. 2013/03/29

    

    dnmacleod Well-Known Member Thread Starter

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    Yes. I was going to suggest that I do that for him anyway.

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