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Latitude E4200 Heatsink/Fan Problem

Discussion in 'Dell Latitude, Vostro, and Precision' started by lambition, Dec 3, 2009.

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  1. lambition

    lambition Notebook Guru

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    I have seen many people complaining about E4200's continuous running fan.

    Today, while swapping my Latitude E4200's bottom case (it had scratch when I purchases, so requested replacement part) I removed heat sink and found there is design problem with this heat sink.

    When I removed the heat sink I found thermal grease left on the CPU to be pretty thick. It should be very thin so that heat is transferred to the heat sink better. (More metal to metal contact).
    I also found one side is thicker then the other side. The thicker side was where heat sink extends to cover the mainboard chipset.

    When I applied force on heatsink with fingers, I noticed temperatures dropping by few degrees.
    Thin spring on the sink was not providing enough pressure on the heat sink for the heat sink to have good contact with CPU.

    Another problem I found is the heat sink it self is very thin and weak. When I applied pressure on the heat sink with my fingers, I ended up bending it. Now heat sink over the mainboard chipset was lifted up and not even contacting the chipset. There is nothing holding that part of the heat sink to the mainboard.

    Right now, I'm trying to figure out a better way to apply pressure to the heat sink.

    While this probably does not completely eliminate fan running all the time, I'm sure I can reduce speed that is is running at.
     
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