11/7/2023 0 Comments T400 fancontrolOnce you've drilled the holes, you'll probably want to smooth their edges. Make sure to space the holes out enough that you don't weaken the case excessively - this is a high-stress area and a case failure here would probably destroy the fan. Basically you're trying to make as wide and direct a path for air into the fan as possible. Put the heatsink aside, take up your drill, and drill a series of holes in the plastic casing so that you'll be able to see fan from outside the case once everything's back together. If you're going to go ahead with the surgery, take a good look at the way the fan sits in it's place when it's installed, and take note of what part of the case directly covers the "face" of the fan. I took this trade-off because I almost never use the machine on a surface that could convey that type of spill, but your mileage may vary. There is a bit of a trade-off in that you're sacrificing a bit of the spill-resistance Lenovo have designed into the machine by opening up holes on the bottom of the case that lead directly to the interior - normally, the intake holes underneath the laptop lead air on a convoluted course that will prevent coffee spills or whatever from being sucked up by the fan or generally getting inside the machine, but it's this convolutedness that contributes to the overheating problems in the first place. This step is optional, but in my opinion very worth doing. Mostly, don't just lay it "face down" on your bench and you'll be okay (anyway, doing that will get thermal grease all over your work surface). During this process, be careful of the heatsink surfaces - to extract heat effectively, the parts of the heatsink assembly that contact the chips on your motherboard have to be flat and perfectly parallel to each other, and the heatsink is made of soft copper that can bend or scratch pretty easily. Again, you're trying to blow opposite the airflow in order to dislodge the most dust. To clean the heatsink, hold the fan still with a finger (if you don't, the airflow may drive it past it's maximum RPM, leading to premature failure) and blow compressed air into the heatsink's fins where the hot air normally comes out. This is particularly important for the case because there are filter screens in the vents that accumulate a ton of dust, and blowing with the normal airflow will just pack it in tighter. In general, you want to blow air in the opposite direction the fan usually pushes it. In particular, blow air into the case vents under where the fan sits, under the metal plate beneath the fan (which hides more vents underneath itself), and aim some underneath the motherboard. With the heatsink/fan removed, attack the whole business with a can of compressed air.
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