AOC 2219Vg white screen

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  • mikey5791
    Badcaps Veteran
    • Dec 2014
    • 504
    • Malaysia

    #1

    AOC 2219Vg white screen

    Hi,
    Got this used AOC monitor from a cybernet cafe complain of it displaying just white screen.
    I checked the power board Changhong 715G2510 -1-4 Ver:B and detected 5vdc (both red wires) at output pin CN902. In addition, i also detected 5vdc (both red wires) at the input pin CN201 of the smaller card.(controller card?)
    Next i checked the t con board but found only about 0.02vdc at the 5V test point. There is no other voltage detected on the t con board.
    The only fault suspect is the controller card. My suspect could be wrong and hope someone experience can point me in the right way.

    Can someone kindly assist and guide me in solving this mystery of the missing voltage. I am looking forward to learn and diagnose from the basic step if time permits.
    Attached Files
  • lotas
    Badcaps Legend
    • Jan 2016
    • 4459
    • Russia

    #2
    Re: AOC 2219Vg white screen

    The problem is rather in the Q601 -Mosfet transistor, power is supplied to the T-con matrix through it.
    Attached Files

    Comment

    • mikey5791
      Badcaps Veteran
      • Dec 2014
      • 504
      • Malaysia

      #3
      Re: AOC 2219Vg white screen

      Hi lotas,
      Thanks for your reply.
      Fyi, i had another working power board and controller board for this AOC 2219Vg (but cracked screen) which i swapped on the display panel. Too bad the screen still shows white screen.
      Any other suggestion or assistance in getting this monitor fixed is highly appreciated.

      Comment

      • lotas
        Badcaps Legend
        • Jan 2016
        • 4459
        • Russia

        #4
        Re: AOC 2219Vg white screen

        Well then, the problem is in t-con, is there 3.3v at this point?
        Attached Files

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        • mikey5791
          Badcaps Veteran
          • Dec 2014
          • 504
          • Malaysia

          #5
          Re: AOC 2219Vg white screen

          Lotas,

          There is no voltage on t con board test point 3VDD or on 5V test point.

          Comment

          • lotas
            Badcaps Legend
            • Jan 2016
            • 4459
            • Russia

            #6
            Re: AOC 2219Vg white screen

            Check fuse.
            Attached Files

            Comment

            • mikey5791
              Badcaps Veteran
              • Dec 2014
              • 504
              • Malaysia

              #7
              Re: AOC 2219Vg white screen

              Lotas,
              The fuse at F1 has continuity and there is no burning mark seen anywhere on t con board.

              Comment

              • lotas
                Badcaps Legend
                • Jan 2016
                • 4459
                • Russia

                #8
                Re: AOC 2219Vg white screen

                If there is 5v and no 3v, then it remains to replace IC3
                1117 33.
                Attached Files

                Comment

                • mikey5791
                  Badcaps Veteran
                  • Dec 2014
                  • 504
                  • Malaysia

                  #9
                  Re: AOC 2219Vg white screen

                  Lotas,
                  But in my case if there is no 5v or 3v on the t con board, is it likely Q601 mosfet transistor on both the controller board is bad?

                  Comment

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