Computer Repair Tips

Help and advice related to computer repair and maintenance


Fix Laptop Overheating Shutdown Problem

 




This article describes a common overheating laptop scenario along with a fix that works.

Overheating laptop and related shutdown problems are very common in notebook computers, especially in home use.  Common symptoms of laptop overheating include some or all from this list;

  • Laptop is extremely hot to the touch, especially around the fan exhaust area
  • Laptop fan is constantly running at high speed
  • Laptop shuts down by itself when doing nothing
  • Laptop shuts down when playing games
  • These laptop overheating or shutdown problems become worse over time, rather than getting better.

In around 1 in 10 cases of laptop overheating, there is potentially a phyical fault with the cooling hardware.

By this I mean either a mechanical failure with the fan where it can no longer spin, or it spins too slowly, or a motherboard electrical fault which exhibits itself by not telling the fan to spin fast enough to cool the laptop.

However 9 out of 10 cases of laptop overheating are caused by an airflow blockage.

In these cases, the fan is spinning as fast as it can, but if the hot air is obstructed from reaching the outside world, a heat build-up occurs and the laptop takes the safety precaution of turning itself off, rather than allowing permanent damage to occur.

I will very quickly explain how a laptop cools itself.

Heat from the CPU, and sometimes the graphics chip, is conducted away from the processors via strips of copper metal. At the far end of this copper heatsink, the heat is fed into a series of side-by-side metal fins. This grill provides a very large surface area for the heat to be spread over.

A fan then draws air from the outside world and blows across the hot grill, back towards the outside. As it does so, the air picks up heat from the hot metal fins and takes it away from the laptop.

Image of the Laptop Repair WorkbookIn an laptop overheating due to an airflow obstruction scenario, the most likely culprit is a build-up of material in front of the metal heatsink grill.

The fan will be drawing in cool air from the outside world through vents in the bottom or sides of the laptop and occasionally there might be a tiny piece of fluff, hair or dust sucked in with the cool air.

When this air is being blown across the hot metal grill, the airborne material can get stuck on the front of the metal fins if it is large enough.

If this keeps happening over time, gradually more and more material will build up on the front of the grill, creating an obstruction.

A common example of this buildup of material is shown in the image to the left.  All of that grey furry material is a combination of dust, lint, hair or fluff that has been compacted on to the front of the heatsink grill.

Picture of a dust obstructed laptop heatsink finsThe effect of this is to block some of the airflow over the heatsink grill. With less physical space for the air to get through, the air is not picking up heat from the whole set of fins.

So a smaller amount of heat is transferred to the air in it’s journey to the outside world. With less heat being removed, the heat starts to build up inside the laptop (overheating).

Temperature sensors detect this and will react by making the fan spin faster and faster. The point of spinning the fan faster is to force more air through the available gaps, and past the hot metal fins to pick up more heat.

This compensation of spinning the fan faster can work to an extent, but eventually a limit will be reached. If the heatsink grill is sufficiently blocked, the fan will be spinning at maximum speed and it will no longer be possible to reduce, or even stabilse, the internal temperature of the laptop.

Temperature sensors will realise this and as a final failsafe protection measure the laptop will power itself off. The hope behind this is that if the CPU is no longer producing more and more heat, the existing internal heat will gradually dissipate of it’s own accord and the laptop will, hopefully, avoid serious damage.

To fix this problem, you need to strip the laptop down to allow access to the heatsink and fan(s).

I’m not going to explain how to strip down a laptop, step by step, as there are guides elsewhere explaining this in detail, and some manufacturers, for example Dell, even provide Service Manuals on the support pages of their website.

In most cases, to disassemble a laptop, all you will need are one or two small screwdrivers.

Some laptops require special torx screwdriver heads to remove some of the internal screws, so you will need to investigate this in relation to your particular laptop make and model.

Dell Vostro 3700 Heatsink Fan AssemblyLaptop Fan with Screws CircledThe pictures I have taken for this post were from an overheating Dell Vostro 3700 laptop.

It would shut itself off after about 15 minutes of average use.  It was extremely hot to the touch around the fan area, and the overheating problem had gotten progressively worse over time.

The Dell Service Manuals explained how to remove the heatsink / fan assembly.

In this overheating laptop, the fan was mounted on to a plate so I removed the screws holding the fan.  I’ve circled the tiny screws for easy identification.

The top image in this post shows the build-up of dust on the front of the heatsink fins.  In fact, it also goes to show that you don’t need a massive wad of dust to cause overheating and shutdowns.

In this case there was approximately 90% of the fins obstructed by a thin layer of material, but you can also see that there are still a few small gaps where a little air will have been able to pass through.

Each make and model of laptop will have it’s own threshold as to how much obstruction there can be before it causes a problem.  I’ve seen cases where there is a large solid strip of dust and fluff, several millimeters thick, that peeled away in one large piece.

An image of a Clean Heatsink GrillImage of the cleaned laptop fanAfter brushing away most of the dust build-up, I gave the heatsink fins and the fan a good blast with compressed air.

This blew away the last remnants of dust, and left a nice clean shiny heatsink grill and fan.

All that remained was to reassemble the laptop using the same steps as before, except in reverse.

The laptop is now working well and no longer overheats or shuts off by itself.  A side-benefit of this fix is that the laptop now runs a lot more quietly.

Because the fan can now remove the excess heat in the laptop while running at a slower speed, it reduces the fan noise.  The laptop is also a lot cooler to the touch.

So this overheating laptop is fixed and working perfectly again.




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23 Responses to 'Fix Laptop Overheating Shutdown Problem'

  1. Aadi says:

    Thanks for the tips! This is true.
    I just blow air by mouth into the Laptop fan fins.
    Dust came out. I did several times and Laptop problem was fixed!

    Great article! Thanks for tips!!

  2. Swordfish says:

    I experienced shut down due to over-heating twice with my HP Pavilion dm4. The service manual instructed to remove several components before I can get to the heat sink.. But I decided to try an easy way first. I shut down my laptop. I used a house vacuum with a crevice tool and vacuum the heck out of the air intake and the air vent. Now the heat sink area is cool to touch. I would do this once every 3 months. In addition, I am using a Targus Chill Mat to help cool down the bottom of my laptop.

  3. CLAMARION says:

    Thanks a lot for this article. I have a Dell Vostro 3700 with the same overheating problem. I am going to try your solution.

  4. Some Satisfied reader says:

    Hey, I have a Dell Vostro 3700 just like yours and its suffering the same thing. I disassembled the laptop myself using the dell service manual (im 13 btw). Just as you said, there were some bits of dust on the fan. so i used cotton buds to remove them. I havent checked the results yet but i think it’ll work just fine. thanks for the tip. appreciated.

  5. Alexander says:

    @Erwin
    Dell provides a manual for dissembling your Laptop down to the cooling
    system:
    http://support.dell.com/support/edocs/systems/vos3700/en/SM/Heatsink.htm
    Just follow all steps until step 12 (step 4 is actually not required!) then
    open up the fan part of the cooling bridge and vacuum it. It’s not actually
    that hard! All you need is a medium-size Phillips screwdriver (~4mm) for
    getting to step 12 and a tiny one (1-2 mm) for opening the fan. It’s well
    documented and doable within an hour. Good luck!
    As a temporary measure: Updating your BIOS will help too:
    http://www.dell.com/support/drivers/de/de/dedhs1/DriverDetails?driverId=HWTCT&fileId=2731113448

  6. galin says:

    well i have a laptop toshiba satelite L670-1LP and its overheats alot its gets soo hot that i cant use my keybord or my mouse can some one help me what to do i think soon it will burn the cpu or the video chip

  7. Stephen L says:

    A friend of mine disassembled my laptop (Toshiba Equium A300D) a few months ago but didn’t find any blockages. My laptop is still overheating and shutting off. It makes a lot of noise before it turns off so it sounds like the fan still works.

    What could be the cause of this? It’s really annoying. I can’t watch youtube videos, play games, install certain updates, etc.

  8. sundaresan says:

    i have lenovo laptop is this not working clearing
    when starts the window it start the loading and does’nt open anything >>>> nw wt can i do please HELP ME

  9. dazimon says:

    Thanks! That was it. (The heat sink in your picture looks clean next to what I found out in my laptop! It look as if somebody lost his toupe in there!

  10. qzcolips says:

    One of the things that I know is to place your desktop or laptop on a very air conditioned place, another is to change your fan and last there are some parts that really requires replacement might be on the verge of exploding. But I would suggest to replace all laptop parts that are slow functioning.

  11. Yogesh pal says:

    Thanks for providing this solution, i was think that it occur only in my laptop.

  12. Shreejan says:

    thanks.i thought that this problem only existed in my dell
    there are other dell suferers too

  13. vicky haswani says:

    i have dell laptop i have purchased new recently just before 3 months i m using net and while using it shut down but when i don’t use net like apart from net i used something other then it doesn’t shut

  14. Paul Bristow says:

    I have had the same problem twice now on my Dell Vostro 3700 and even though this sorts it, it will happen again. The only solution I have found to prevent this is to cover the air intake vents on the bottom with speaker cloth or special dust traping material which can be found at most PC shops. This can prevent the dust from getting in again, causing you to have to strip the laptop again.

  15. smile says:

    this is what i did to my hp dv6-6100se when it started overheating in a room tem above 30 degree
    it was helpfull to me and now when i am writting this it has been almost 2 hour but there is no hot air no spinning fan no and nothing

    take a look here

    http://www.helpowl.com/q/Hewlett-Packard/Paviliondv66100/Technical-Support/hp-dv66100se-amd-quad-core/173310

  16. harish anand says:

    my laptop automatically power off…. continuously ,

  17. Erwin says:

    Well done, mate!
    I have also a Dell Vostro 3700 and I have got some overheating problems. I am considering opening my notebook, but I am scared because I might “destroy” it.
    So, after you remove the back side, what do you remove then? The hard drive? And after that? Sorry, Dell doesn’t tell you how to remove everything…
    thx

  18. steven says:

    yea its well constructed…….thumbs up!!!

  19. ABIE says:

    Thank you for this tips. I am actually needing this one in ventilating my laptop.

  20. Ben the Computer Guy says:

    I like these tips on fixing an overheating laptop. I find lots of dust and dirt inside the fans when taking apart laptops also. Another common problem that I have seen is that in some HP laptops, the heatpipe is too small or it doesn’t cover a large enough surface area. This causes the heat to build up on the graphics chip (VPU) or on the processor (CPU) heatsink. Often times, a remedy for this, is to find a decent strip of metal to replace the small or nonexistent metal plate that goes over this. You can also find a decent thermal paste and then cover up the chip with that, be careful not to put too much on there though. This could cause a short in the system. Just a small dab of the thermal paste is usually sufficient.

  21. PC repair manchester says:

    Very helpful article and well written, cheers

  22. build the best computer says:

    You’ve got great insights about pcs and laptops, keep up the good work!

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