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
  • 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
      • 14054
      • 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 :/

        Comment

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