why does my laptop overheat so fast
There are all sorts of reasons why your laptop would heat up too quickly or overheat. Here are a few:
1. Processor (or graphics) working too hard. Open the Task Manager (Ctrl+Shift+Escape) and monitor the "CPU Usage" graph. If it is in double figures over long periods of time (and certainly if it's approaching 100%) then your CPU is overworked. If this is the case, get back to us and we'll suggest ways to diagnose the cause. 2. Dirty heatsink/airways or blocked airways. Laptops are air cooled, so it's important the vents, heatsink and fan are not blocked or caked with dust. If they are, cooling will be ineffective. Solution: clean them. 3. Heatsink separated from CPU. The heatsink (a metal block, or "radiator") is attached to the processor witha small amount of termal paste which transmits the heat away from the CPU to the metal block. Unfortunately, on some computers the paste either loses its qualitises over time, or the heatsink gets separated from the CPU mechanically (e. g. if the laptop is dropped). The solution is to replace the thermal paste. It's too complicated to explain this in words alone, but there are excellent videos on YouTube showing how to do this (or you could ask a technician to do this). 4.
Other cooling problems. The fan might be faulty (this is usually self evident, as it either does not turn or makes a rattling noise), the heat pipes have lost their vacuum (these are the tubes connecting the heat sink's metal block to the exhaust radiator). These are too technical for most end users to tackly alone, and a visit to a technician is warranted. Testing the Temperature Quite a few people have commented that I used way too much thermal grease (compound) and that the amount I used would cause overheating. I disagree with this view. So in an attempt to provide some kind of proof, one way or the other, I decided to monitor the temperature for a few weeks with SpeedFan v4. 44. Then to take the laptop apart again, clean it up, using the suggested alcohol wipes method, and replace the thermal compound. This time I would use a thin amount. I would than assemble everything and then monitor the temperature again. I followed the same process as before with the slight suggested changes. This documents that process. According to the CPU chip specifications for a LF80537 T5500, which is a Intel Core 2 Duo Mobile, the Minimum/Maximum operating temperature (`C) is 0 - 100`C. The maximum operating temperature of the CPU was 65`C before I started this process.
After I completed the process the maximum operating temperature was 60`C. It seems I might have applied too much thermal compound but not way too much to cause overheating. Just too much as in wastage. It would seem as if excessive amounts of thermal compound could cause your system to heat up slightly more and if it is running close to the maximum allowed temperature it might cause overheating. It caused a 5`C increase in temperature in my case but this is not definite because it was not a controlled situation. The increase was not enough to cause overheating, but enough to deduce that excessive amounts of thermal paste could increase the temperature. The photos contain a step-by-step guide of what I did. Notes: Wipes I found the alcohol wipes worked terrible. It smeared the thermal grease all over and just created a bigger mess to clean. It could be because the previous thermal grease was al dried out and flaked off nicely. This thermal grease was wet and sticky. It smeared too easily. On the GPU there are very small resistors or components and the wipes smeared the thermal grease all over them and then kept getting caught in them. If I were to do this instructable from the start over again, I would use less thermal grease from the start as it does make a difference no matter how slight, but I would not use the alcohol wipe.
Update 2013 I have been ripping Intel CPUs out of laptops and desktops and replacing the thermal compound (grease) for years now and have noticed that on the older Intel CPUs the thermal grease was used liberally. However, on the newer CPUs the compound is quite thin. I wonder if it really matters that much or is it cost saving to have a very small (tiny) amount of compound in between the CPU and the cooler (heat sink)? Here is what Intel itself says about how to apply thermal grease to a CPU. What you will read will surprise you because there is no mention of layer thickness and no mention of spreading it around. To tell you the truth it states that you blob everything in the centre of the CPU and the pressure of the cooler (heat sink) on the CPU will determine the thickness, squeezing out all excess. I think I also mentioned something like that in one of my comments. This information comes straight from the CPU manufacturer, and they should know. Read for yourself at: I have included some of the photos from the Intel site for reference. I have also replaced the thermal grease (compound or interface material if you are from Intel) on many secondary chips like integrated GPUs on motherboards by releasing the cooler (heat sink), cleaning both surfaces, apply thermal grease and replace.
Once you know how, you can replace the thermal compound on practically anything. Update 2014 Many people are still suggesting I am using too much thermal grease. I want to bring the following to the attention of these people. I am using a non conductive thermal grease. It does not conduct heat as well as the conductive thermal grease but does not damage components when it comes in contact with them because it does not conduct electricity. Cooling has to do with getting rid of excess heat, so the thermal grease is only one part of the solution. The heat sink, fan and airflow are the other parts. You could have a CPU that does not have well applied thermal grease but has a fantastic heat sink and airflow across it and the system will never overheat. Here are some links to other resources which I found very helpful in understanding overheating, thermal grease, fans and airflow. I hope this helps everyone understand more about what causes overheating and how to solve the problem.
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