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Asus vz239h-w no display

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    Asus vz239h-w no display

    When I turn on the monitor, the screen does not light up. But when I shine light on screen, the ASUS LOGO image can be seen. But after a few seconds, the logo disappears and the power light turns orange which means standby.

    I have checked backlight leds, they are all working. That means not backlight led problem. In other words, there is power to the backlight leds.

    I found that when turned on, there is no voltage on all capacitors. So I suspect that something wrong with the chips. I started with the two chips closest to the power input, the one with the markings of "P8019 CDB9K" and "YVBJA". But I could not find any information from the internet. Could somebody please help me to find the information/datasheet on these two chips?

    Of course, any suggestions on how to fix this monitor will be welcomed.
    Attached Files
    Last edited by tmhobadcap; 08-05-2023, 04:30 PM.

    #2
    Re: Asus vz239h-w no display

    YVBJA = SY8366QNC
    P8019 CDB9K = APA2604CQAI

    Will attach schematics later, keep getting "VZ239.zip:
    Upload of file failed. "

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      #3
      Re: Asus vz239h-w no display

      Schematics
      Attached Files

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        #4
        Re: Asus vz239h-w no display

        Thanks a lot Lisa Su.

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          #5
          Re: Asus vz239h-w no display

          Sorry, I made a mistake. I mentioned that there were no voltages on all capacitors after turning on the monitor. That is incorrect. I just found that the power plug is loose making no contact at certain angle and so I could not get any voltage. But the no display problem and other founding are still true.
          I am now trying to check which components might be defective by following the service manual provided by Lisa Su.

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