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hp compaq presario b1200 no power

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    #1

    hp compaq presario b1200 no power

    mb code:
    hstnn-137c 6050a2136401-mb-a03

    hp compaq presario b1200 no power

    burnt mosfet AM4825P_AP
    replaced with same but still no power

    correct me if im wrong please
    but wont the 19v in pin 1-3 of q1001 also goes to pin 5-8
    somehow, 19v wont get past mosfet q1001
    it seems like mosfet wont switch?

    attached are the schematics
    please help

    thanks in advance guys
    Attached Files
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    #2
    Re: hp compaq presario b1200 no power

    Are you sure you have the correct power adapter? That is the circuit that senses the adapter via the center pin.
    Originally posted by PeteS in CA
    Remember that by the time consequences of a short-sighted decision are experienced, the idiot who made the bad decision may have already been promoted or moved on to a better job at another company.
    A working TV? How boring!

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      #3
      Re: hp compaq presario b1200 no power

      Originally posted by Th3_uN1Qu3 View Post
      Are you sure you have the correct power adapter? That is the circuit that senses the adapter via the center pin.


      i got the same problem here. what should be the right adapter. i used 19v 3.5a

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        #4
        Re: hp compaq presario b1200 no power

        If Q1001 is getting hot then +vadpbl line short I had some filter caps short used the bench power supply to find it showed up after 20sec,the cap got hot.

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