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

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

    This board has problems when external Display is hooked up to Thunderbolt port. Internal and external displays stay black until you close and open the lid a few times. Then they both work properly.

  • #2
    Do you have original 85W charger?
    Check SMC_LID signal when the screen is black.

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    • #3
      I’m not sure what customer uses. I do have 85W.
      I only have board and display for this one. I guess SMC_LID won’t work without housing or I could use a magnet somewhere?

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      • #4
        You don't need to trigger lid sensor.
        Just check if its signal remains steady high.

        Lid sensor is located on J5250, near audio connector.

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        • #5
          Sorry, wrong information. Just got the board in front. It actually doesn't show picture when starting, but it does when lid is closed and opened a couple of times, while Thunderbolt is connected.
          Last edited by djdblaster; 02-10-2019, 01:08 PM.

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          • #6
            Does it have High Sierra OSX installed?
            If yest, test it with El Capitan.

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            • #7
              No internal SSD at the moment. I'm testing with an external drive with High Sierra. Should I install El Capitan on it? How about SMC reset?

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              • #8
                You can try PRAM and SMC reset too.
                Don't you have a preinstalled USB pen with El Capitan?

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                • #9
                  Not yet, but I do have one drive with it which could be put into external housing.

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                  • #10
                    SMC_LID 3.42V with display only connected, outside the housing.

                    SMC and PRAM no luck.

                    Do I still have to try El Capitan? I don't see how that would be connected to no image and no backlight. I would be happy with a question mark folder screen.

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                    • #11
                      Some backlight issues have been reported for High Sierra...
                      You don't lose anything by trying.

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                      • #12
                        Sure. I'll go ahead and try.

                        How about the quesiton mark folder? Should it always be there independent of OSX?

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                        • #13
                          I tried with El Capitan. Nothing on screen.

                          Laptop starts with black screen, nothing can be seen using flashlight.

                          For backlight LCD_BKLT_EN is missing. Goes straight to U9100 (eDP MUX sheet). So something with MUX then since I see HDMI and DP involved on this sheet?

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                          • #14
                            Any ideas maybe? Board is super clean.

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                            • #15
                              Do you always get normal image on internal LCD?
                              The problem appears only when external monitor is connected?

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