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820-3437 fans spin, no chime

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  • 820-3437 fans spin, no chime

    Very small liquid damage near U1900.
    Came to us only with light on charger with no fans spin.
    Path between U1900/3 and R1905 and between R7546/1 and C7588/1 was burned.
    With jumpers got fan spin now but no chime/image and after a few minutes turns off.
    Dont know where to start - I am not good at this issue
    Any help?

  • #2
    Do you get voltage at all big coils?
    ALL_SYS_PWRGD present?
    Check U1950, pins 7 & 3 for high level.
    U1900 is right near U6100, so check all SPI termination resistors and traces for BIOS chip.

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    • #3
      ALL_SYS_PWRGD got 3.29V
      U1950 pin 7 and 3 got 3.41V
      All SPI was OK.
      Replaced U1900 just in case is all working fine again.
      Thank you for help - solved.

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