Toshiba Satellite A45-S250 Notebook Logo
Posted on Nov 13, 2007
Answered by a Fixya Expert

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The laptop doesnt start up. cooling fan is brocken. thermal oil is old and almost dry and little

my toshiba sat a 45 fan did not work so I shut down the laptop after 3 min then I opeend the machine I saw that the cooling fan for the heatsink is brocken beause there was a short in the wire (yellow wire) then I tried to on it without fan it did not start I offed it after 30 seconds then put the brocken fan I mean bluged it also did not work. my thermal grease is very little almost dry the heatsink gets very hot when I oned pc for tese 10 seconds. just I see green light or some times the orange light of power blinks.

there is no toshiba service in my city and all others said mother bord might got brocken but they guessed they havent opened it and checked even. laptop doesnt smell bad even this cpu small chip doesnt smell I offed it fast though, so what should I do? if there is brocken fan it wont start? I mean the pc. if there is less oil it would burn the chip in 30 seconds of starting ? but why so if the fan even some times stops working for long time in usual working please tell me if there is something I can do to fix it


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  • Posted on Nov 15, 2007
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Joined: Oct 29, 2007

Sometimes depending on the version of BIOS there is a thermal shut down feature,If the CPU gets to hot it will shut the entire system down.What you can do is replace the CPU fan and apply more grease in between the heat sink and the CPU chip.If this does not solve your problem then you may have damaged the CPU.the best way to fix this is to replace the motherboard and CPU.Try replacing the fan first because if your computer has the thermal shut down feature then chances are that it protected the motherboard and CPU from any damage.Try the simple things first! GOOD LUCK.

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First thing to check is if the laptop is dirty inside. From your brief diagnostic statement this is what I suspect.

Second thing is to replace the Thermal Paste, and Thermal Pad.
Thermal Paste dries up over time, and repeated heating.
(A Thermal Pad is impregnated with Thermal Paste)


1) Laptops are cooled by air inside. The cooling assembly for the laptop, cools the hardware components inside the laptop.

Main article,

Specific area,

Here you see the cooling assembly.

The small multi-bladed Black fan, sitting in the aluminum d-shaped shroud; is the Fan Assembly.
The curved copper tube is the Cooling Tube.
To the right of the D-shaped fan shroud, and copper Cooling Tube; is a rectangular finned Heatsink.

At the bottom of the Cooling Tube is the small metal plate, that sits on the Processor. It's mounting screws are circled in Red.

The Cooling Tube is a slightly flat copper tube, that is sealed on both ends; and filled with Nitrogen.
Heat from the Processor is absorbed by this small metal plate, and then absorbed by the Cooling Tube.

The Cooling Tube transfers the heat up to the finned Heatsink.
The Tall, Thin fins of the Heatsink absorb the heat, then radiate it away.
Air flow from the Fan Assembly, helps carry heat away from the fins of the Heatsink.

Dust, dirt, lint, hair, food crumbs, name it, is drawn from underneath by the Fan Assembly.
This clogs the fan blades, and fan shroud; and fins of the Heatsink.
The cooling capacity drops tremendously.

One example using a Dell XPS laptop,

See that thick 'dust bunnie' he removed from the finned Heatsink?
You wouldn't believe the amount of 'Gunk' I have found in laptops!
That video pales in compare!

(Tobacco smoke is a good one. Sticky gummy residue. So is carpet deodorizer. EVEN spider webs!)

The Processor, and graphics chipset; are the two hardware components that give out the most heat.
Desktop or laptop.

When a Processor overheats it turns off. (BIOS turns if off)
This is a fail safe feature built-in. Keeps the Processor from burning up.

2) The top of a Processor, and the top of a graphics chipset, (GPU), are not perfectly smooth. Neither is the bottom of the metal plates, that sit on them.

A magnified view would detail, "Hills, Valleys, and Pitholes'.
When the two components are placed together (Processor/Cooling Tube plate; Graphics chipset/Cooling Tube plate), there are air pockets that are created.

Air is an Insulator, not a Conductor.
Thermal Paste fills these imperfections, and is an Excellent conductor of heat.

Thermal paste dries up over time, and repeated heating. Looses it's thermal conductivity properties. (Thermal Pad is impregnated with Thermal Paste)

This is why is is conducive to THOROUGHLY clean the old Thermal Paste off, (and peel the Thermal Pad off), and replace the Thermal Paste. (And Thermal Pad on graphics chipset)

As in the previous solution, USE an ESD wrist strap, and have it's alligator clip attached to a good ground source.
Do NOT use one, and prepare to use the laptop for an expensive doorstop.

For additional questions please post in a Comment.

Laptop overheating

strip the laptop down, get to the cooling fan for the CPU and GPU and remove it. loosen the screws in accordance with the numbers on the sink. remove existing thermal paste with nail varnish remover and a clean cloth off both fan and CPU and apply fresh stuff. this is important because the old paste is burnt on and no longer aiding heat to pass through it. also the laptop is shutting down after a while because the fan heatsink is clogged with debris clean that out by removing the little fan itself out of the heatsink. this is most likely your problem if the laptop is over 2 years old. any help you need just ask :)

Dell d610 shuts down while playing games

Some games require more processor use, some less.

If the games that cause your computer to shut down feature high resolution graphics or fast 3D rendering, then the problem could be insufficient processor cooling. Once the processor gets overheated, it goes into thermal shut down.

If, while you play, the computer runs hot before it shuts down (check the cooling fan outlet), then these are some of the possible reasons:

-cooling fan blades could be obstructed by dust - cooling fan needs to be cleaned or replaced

-heatsink radiator and / or air outlet could be obstructed by dust - also need(s) to be cleaned

-thermally conductive grease on the microprocessor heatsink could be
partially or entirely dried up - old grease needs to be carefully removed and new grease applied (caution - do not use any kind of thermal grease that contains metallic particles like silver or aluminium - you might short out the processor - only use the kinds which are electrically nonconductive)

of course the problem could be elsewhere, but the above mentioned problems turn out to be a common issue with many laptop computers after a few years use, regardless of manufacturer brand and model, also it could be any of or the combination of any or all of the above problems (obstructed air outlet leads to more dust being deposited on the fan blades, more dust on the fan and outlet leads to processor overheating which leads to thermal grease drying which leads to even more overheating and so on...)

hope this helps somewhat


A85S107 Toshiba Laptop: Laptop will run for approx 6 min and gets hot and shuts off. Cooling fan clear and runs properly. Tried cooling pad to no avail.

If you are sure that it's not the fan in question then you'll need to check the heat sink could be too much or too little thermal compound

My computer just went belly up! It is a reconditioned IBM ThinkCenter, a little over 2 years old. It was running normally and then all hell broke lose, cooling fan went berserk sounding like a hair dryer...

you need to clean the heatsink of the processor remove it from the motherboard by turning the lock to counter clockwise to 90 degree only all four lock then pull it up gently check for the thermal paste if it is dry you need to add a new thermal paste before you add make sure that you clean the back of the processor or remove the old paste that already dried out, just a small amount you need to apply, then before placing back the heatsink to the processor make sure you already turn the lock to lock position by turning it clockwise 90 degree then make insert it correctly to the four holes in the motherboard then press the lock down slowly to lock one by one,

Unexpected shut down of my laptop

It is quite possible that the laptop is overheating and the processor has a thermal shutdown circuit. Take a can of compressed air from an office supply store and blow the dust and hair out of the ventilation grills on the laptop. Once you do this, reboot the laptop and make sure the laptop fan is running. If a system has been run hot for a period of time, it is also possible that the thermal paste on the processor has dried up and has "caked" on the processor/heatsink lowering the efficiency of the cooling properties. In that case, the heatsink would need to be removed and a new layer of thermal paste applied.

My Toshiba P35-S611 shuts down without warning a short time (2 min-45 min) after it boots up. The battery isn't hot but the heat dissipation fins in the back are very hot.

Indications of laptop overheating problem:
  1. The keyboard and the bottom of your laptop are very hot when the laptop is working.
  2. The CPU fans are working all the time at maximum rotation speed and operate much louder than before.
  3. The laptop suddenly shuts down by itself without warning. When it just started, the laptop was shutting down after 1-2 hours and how it shuts down after 5-10 minutes of operation.
  4. The laptop works fine when it runs idle, but shuts down as soon as you start using any memory demanding applications (DVD player, image editing software, video editing software, etc.).

If the CPU heatsink is not clogged with dust and lint completely, you can use canned air and just blow it inside the laptop through the openings on the bottom and on the sides. It’s nice as a precaution measure, but it might not work if your laptop already has a problem and the heatsink is completely clogged.
  1. Open the laptop case, so you can access the CPU fan and the heatsink. In some cases you can access the heatsink through the latch on the bottom of the laptop. Sometimes (for example Toshiba Satellite A70/A75) you have to open the laptop case all the way down.
  2. Carefully disconnect the fan cables on the system board and remove the fan. If the fan makes unusual sound when it spins (grinding sound), I would recommend to replace the fan.
  3. Clean the fan and the heatsink with compressed air.
  4. I would also recommend removing old thermal grease from the CPU and applying new grease for better heat conductivity.

Switches off for no reason

The fans themselves may need to be replaced or the thermal grease on the processor may need to be reapplied. What you are describing is caused by something getting to hot and then shutting the machine down to prevent damage.

My HP Pavillion DV100 notebook shuts down whenever it feels like. What could be causing this.It is 3 years old now so off warranty. It will work just fine for a little while and then voila! shut down.

Sounds like classic overheating, check your power supply fan, or the fan of your heat sync that seats over your CPU as well as the heat resistant insulation thermal lubricant that's there to keep it cool.

When fans starts to go the bears or motor starts to stick and will intermittently stop. When when it goes altogether it ceases to turn and can cause serious overheating damage to your circuitry.


yes its probably the fan but it could also be the screen brightness. replacing the fan and turning down the brightness will cool the laptop. but i agree try a new fan first.
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