820-01598 not booting but has power

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  • bdawg
    Member
    • Oct 2014
    • 13
    • United States
    #1

    820-01598 not booting but has power

    Hello, any help with this is greatly appreciated as always. This board has power but is missing ppvccgt_cpu_ph1 and ph2. The board is taking 20v / 450ma but has no chime, no video. Fan spins and CPU and surrounding components heat up. Resistance on L7410 and L7420 both read 2.8 ohms. I don't have another one of these boards so I am unsure if that is normal. And basically 0v on those. All other rails seem fine. Any suggestions from here?

    Thank you so much everyone
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4435
      • France
      #2
      Re: 820-01598 not booting but has power

      https://logi.wiki/index.php/User:Pie..._I_solve_it.3F
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • mon2
          Badcaps Legend
          • Dec 2019
          • 14077
          • Canada
          #3
          Re: 820-01598 not booting but has power

          For your logic board, review this power rail sequence chart:

            Comment

            • bdawg
              Member
              • Oct 2014
              • 13
              • United States
              #4
              Re: 820-01598 not booting but has power

              Oh I see... thank you very much for the info. I have determined I have no EDP_PANEL_PWR_EN coming from U0500 R0542 is fine. I am guessing U0500 is bad :/

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