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820-4924 - no image or back-light

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  • 820-4924 - no image or back-light

    have a 820-4924 and had very minor liquid on u 8300 and mostly on C8352 pin 2,

    is this a GPU issue, i seen it pin 2 of C8352 goes to the GPU,

  • #2
    There is no dedicated GPU.
    Mentioned line goes to CPU.

    Do you get chime and USB activity?

    Check if you get voltage on L8300; there must be 5V in the first 1-2s, even without LCD connected.

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    • #3
      there is image and it works perfectly on external display,

      also i do have 5V on L8300

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      • #4
        Post exact voltage for DP_INT_HPD and PPVOUT_S0_LCDBKLT; with internal LCD connected.

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        • #5
          DP_INT_HPD 0.0v

          PPVOUT_S0_LCDBKLT 0.0v

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          • #6
            "DP_INT_HPD 0.0v"
            PCH cannot detect the LCD in this case.
            You must check this signal when 5V is present at L8300.
            Try known good LCD assembly; be aware of year compatibility.

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            • #7
              i checked DP_INT_HPD while a known working display connected and also known year to be compatible.

              also yes, i checked L8300 having 5v while testing DP_INT_HPD

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              • #8
                Check LCD_HPD_CONN too.
                Should get 2.5V there.

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                • #9
                  sent it back, could not figure it our

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