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Hi, can you help me please. I have a dell c640 laptop. It switches on for 5secs then goes off. I have found a m5236 -3.3BM chip over heating (very hot). I have ordered a new one. but there must be something that causes it to over heat with too much power going to it. DO you know if it's a faulty transistor or something? thanks

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  • spike47 Mar 13, 2009

    Hi there rupertbear

    I have the same problem , but I cant identify the transistor on U45 , it has S60 on it but I cant find anything relating to that number ! , could you give any more info on it ! .



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The part you are looking for is a reset signal ic with a treshold of 2.93v. There are many parts available that work the same. Like the MAX809s, the STD809s and the MAX6326_UR29. BTW the part description says "09S" not ""S60"


Posted on Mar 28, 2009

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problem is transistor u45 gone short circuit.This is 70mm due north of the micrel Mic5236-3.3bm.Forget the fan.

Posted on Jul 04, 2008

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If it is the processor that is overheating , usually the computer has a "fail safe" when it overheats. It would does an auto shut down so your motherboard does not fry. I would recommend checking to see if your CPU fan is working.

Posted on Jun 21, 2008

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