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820-3332-A doesn't work properly with external display

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  • #16
    No. In order to get image on internal display, external has to be connected and lid closed/open a few times. Then it works normal.

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    • #17
      Understood now.
      For the repair, continue with internal LCD only.
      Check SMC_LID and voltage for pins 28-30 of J9000.
      In the first few seconds, you must get 5V there; even without LCD connected.
      If LCD is connected, LCD_HPD should go high.
      Once LCD is recognized by PCH, all these should stay high and also image/backlight must come on.

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      • #18
        This sounds like U8900 tbh...resolder it.

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        • #19
          SMC_LID 3.4V
          J9000 no voltage on pins 28-30, with or without screen.

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          • #20
            Tried to reflow/resolder U8900?

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            • #21
              I ended up reflowing only MUX. Computer works normal so far... I guess marked as solved?

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              • #22
                Run heaven on it at least few hours...

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