MBA 820-00165 Pulses S0 State then off again every 3sec.

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  • lazaro.089
    Senior Member
    • Jun 2014
    • 87
    • Mexico
    #1

    MBA 820-00165 Pulses S0 State then off again every 3sec.

    No liquid damage, just a little corrosion on R6125 and R6120 but cleaned it.

    Something strange, when I test on diode mode on F7140 (PPBUS_G3H) it beeps for half a second then impedance gets higher.
    If I reverse the proves it shows me low impedance but not low enough to beep.
    Maybe a Short? or ISNS resistor?

    When powered on PPBUS_G3H is 8.6 stable. And tested PP3V3_S0 and PP5V_S0. And it pulses to right voltage and then 0V. It does this every 3 seconds or so.
    Tags: None
    • piernov
      Super Moderator
      • Jan 2016
      • 4439
      • France
      #2
      Re: MBA 820-00165 Pulses S0 State then off again every 3sec.

      CPU VCore probably pulsing too — confirm.
      SPI ROM communication issue can definitely cause this. You already spotted corrosion on R6120 and R6125. There's more. Dirt on J6100, U6100, U6101, damaged/corroded resistor, broken trace, probe point…
      OpenBoardView — https://github.com/OpenBoardView/OpenBoardView

        Comment

        • MobileXT
          Badcaps Veteran
          • Oct 2012
          • 214
          • USA
          #3
          Re: MBA 820-00165 Pulses S0 State then off again every 3sec.

          check the high current sensing resistors if they read by specs.

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