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820-2936 missing U5400

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  • 820-2936 missing U5400

    820-2936 missing U5400
    And missing all pads to solder a new U5400
    Can this board works without U5400? What is its role?

  • #2
    Connect pin 1 of R5403 to pin 1 of R5413. This is cheating but I think it should pass ASD like that. U5400 is the current sensor for the CPU rails.
    Not sure if this will work but run ASD after you did this.

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    • #3
      Problem is this board has no video now. Not lvds and not external monitor. USB mouse is active (light). So I dont know where to start.

      What I checked is in LVDS connector I have PP3V3_LCDVDD_SW_F at 3.3V

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      • #4
        If PP3V3_LCDVDD_SW_F is high there must be an image, check again. Use a flashlight to check.

        What is voltage on PPVOUT_SW_LCDBKLT?

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        • #5
          You are right. It works with another screen. With his screen no video... meybe lcd cable
          With another screen it has video but no backlight. I did a reflow to LP8550 and now backlight is ok. Should I replace it or this is ok

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          • #6
            Up to you, but I would replace to be sure.

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            • #7
              Ok, now I need to replace the screen. It is true all screen A1278 from 2008 to 2012 are the same?

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              • #8
                Just the bare LCD yes.

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