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820-00164 does not turn on

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  • 820-00164 does not turn on

    customer came in water damage yesterday. said it happened 20 minutes ago. I put it in ultrasonic, dry it out and hand it to him working. came back in today with no power. i get orange light

    pp3v2 - 3.42v
    ppbus - 8.6v
    pp5v0-s5 - 5.0
    pp3v3-s5 - 3.3

    board is very clean and there was no corrosion when came in. although the water was in the cpu area.

  • #2
    Check all RTC signals first.
    PM_SLP_SUS_L goes high?
    Check if PM_SLP_S4_L tries to pulse at least.

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    • #3
      RTC reset - 3.3
      ppvrtc_g3h - 3.321
      PM_SLP_SUS_L - 3.322
      PM_SLP_S4_L - if i unplug and replug in power i have 3.027 for about a minute for it goes away.

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      • #4
        If PM_SLP_S4_L appears, some secondary supplies must get voltage too.
        Check all big coils for voltage.
        See if CPU VCORE tries to appear too.
        ALL_SYS_PWRGD comes high?
        Check U1950 area, pins 7 & 3 should go high.

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        • #5
          which is cpu vcore on this board?

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          • #6
            L7310/20...

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            • #7
              L7310/20 -1.811
              L7630 - 1.052
              L7430 - 1.204
              L7701 - 0
              ALL_SYS_PWRGD - 3.321

              U1950 pin 3 - 0
              U1950 pin 7 - 3.426

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              • #8
                SMC_DELAYED_PWRGD doesn't appear?
                Reflow SMC to 180 degrees, with quality flux.

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                • #9
                  relowed smc and still no SMC_DELAYED_PWRGD

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                  • #10
                    Try new BIOS...

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