Hp 530

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  • rop12770
    Member
    • Mar 2010
    • 22
    • Portugal
    #1

    Hp 530

    Hi

    I have this HP 530 with no power. I don't have power on battery pins. No leds, nothing.
    I have tested those PQ40 and PQ41 with Diode test, putting the Red Probe on the arrow and the Black probe on the other connections. It always beeps, so it's shorted right?
    I have inverted the probes, and still does the same.
    Can these components be the culprit of the problem? What to check next?
    Thanks

    PS: F1 is OK.
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    • tschanuka
      Member
      • May 2011
      • 21
      #2
      Re: Hp 530

      You have to remove CPU before doing any continuity tests.
      Pls check again.
      I'm from Germany
      Please excuse if my English is not so good or misleading. Trying my best.

        Comment

        • severach
          Badcaps Legend
          • Aug 2007
          • 1055
          • USA
          #3
          Re: Hp 530

          With motherboards beeping is good to draw your attention but it isn't enough information to determine a short. My meters beep on the diode scale anywhere less than about 0.075 voltage drop. Perfectly good Northbridges can measure 0.065-0.015 voltage drop. A CPU can measure as low as 0.008 voltage drop. Shorts measure about 0.000-0.003 voltage drop depending on the quality of the meter leads and meter zero. On motherboards the numbers matter.

          To make matters worse some meters show 0.000 when beeping even the voltage drop is not zero.
          sig files are for morons

            Comment

            • tschanuka
              Member
              • May 2011
              • 21
              #4
              Re: Hp 530

              Hi severach:
              Thanks for the details.
              Do you have experience with short finders like LeakSeeker or Testec LLC?
              Would be great to not lift/unsolder every suspicious component for testing.
              Maybe a short beeper is even a helping tool to detect defective BGA bridges and ICs?
              Last edited by tschanuka; 09-22-2011, 05:53 AM.
              I'm from Germany
              Please excuse if my English is not so good or misleading. Trying my best.

                Comment

                • rop12770
                  Member
                  • Mar 2010
                  • 22
                  • Portugal
                  #5
                  Re: Hp 530

                  Hi Guys

                  Gonna try without the CPU.
                  Thanks

                    Comment

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