Dell Smart Step 200/250n Overheating Problem solution†††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††† ††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††† By Matt Koestner
††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††† ††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††††† IntegraGSR95@hotmail.com
Small Philips screwdriver
Tiny flathead screwdriver (for removing power button surround)
Some sort of thermal compound, ideally Arctic Silver 3 or 5, but any 99% silver thermal compound should do the job, just make sure its silver!
600 grit sandpaper
OK, the problem is that Dell used some crappy or no heat transfer material between the processor and heat sink.† Not to mention, the copper is very poorly lapped and is fairly rough, which is bad for surface area, which is imperative for good heat transfer.† Aside from the dust issue, which has been covered already, this is a major problem. This fix essentially makes the dust problem a non-issue.† Here is the step by step, the solution.
1) Remove the plastic surround at the top of the keyboard
2) Carefully unplug the power button
3) Remove the 3 screws at the top of the keyboard (here are 2 of the 3, but you get the idea)
4)† OK, this is what we have under the keyboard
5)† The part in the upper right, with the part # beginning with a 60.42z02Ö..remove that, slide it straight down towards you if you are looking at the computer the way you use it
6)† Now we are looking at the top of the heat sink/fan unit.† It is held in by 4 screws, remove these screws
Now comes the tricky part.† The thermal goop they use is a waxy stuff, and when itís cold, it will stick to the processor and heat sink and probably rip it out of its socket.† I got the computer good and hot before I did all this so the stuff was nice and melted, on the other 250n I have, it had zero, as in not any, thermal compound on it, and so it came right apart.† If you can not easily get them apart, DO NOT TWIST!† I can not stress this enough, as it will bend or possibly break pins off the processor.† Pull STRAIGHT up on it. Once the heat sink is out of the way, you will be looking at this:
Yours will not be as silver (this has Arctic Silver thermal compound on it), but will look similar.†
Here is the heat sink:
The copper part at the top is what we are focusing on (again mine is smeared with silver compound; yours will be bare copper, maybe with waxy stuff on it)
Remove any residual thermal material from the copper with a razor and some Isopropyl alcohol, try not to nick the copper surface with the razor.† Now take that 600 grit paper and give the heat sink a good polish.† We are not trying to actually remove a lot of material, just getting it nice and smooth to accept the silver compound.† Once that is done, clean it off with Isopropyl alcohol, as well as the top of the processor.† Apply the Arctic Silver compound in a VERY thin layer as the instructions say, you can just about see through it when its applied correctly.† While you have this all apart, find some compressed air and blow out the tiny fins of the heat sink, Iím sure a few dust bunnies have collected in there J† Put the heat sink back on and tighten the screws in the sequence stamped on the heat sink, go easy on these, it is a heat sink, not a car wheel.† You do not want to bottom the screw against the spring, ĺ way down is good enough, the springs do the rest of the job.
Now all we have left to do is reassemble the thing and enjoy!† I am going on 7 weeks without a single shut down on either computer.† They used to go down at least 3-10x per day.† Right after I did this, I ran Folding @ Home (100% CPU load, tons of heat produced) on it for 36 hours straight and had zero problems.† Under normal loads, the fan come on for about 20 seconds every 5-7 minutes, the temp stays right around 110 at full load degrees F, whereas before, I was looking at 130+ temps inside the computer.† Anyways, I hope this helps some of you, I know it has done wonders for both of my 250Ns. Enjoy!