How to adjust Vsetup and Vsetdn on Y-Sustain on 42HP66

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  • Robb
    Senior Member
    • Sep 2013
    • 159
    • USA
    #1

    How to adjust Vsetup and Vsetdn on Y-Sustain on 42HP66

    Hello, I recently replaced a ZSUS board on a Toshiba 42HP66 that wasn't displaying a picture. Now that the TV is working I'm trying to dial it in a bit.

    The Vs voltage was 4 volts above what the panel recommended so I dialed it back to the suggested 184 volts. The Va was .06 volts above the recommended 60 volts so I dialed it back too.

    The picture is decent but it has a multi-colored pixelation maldischarge when the screen goes to black after a bright image is displayed. I am hoping to find out the proper way to adjust the Vsetup and Vsetdn as these are usually what people suggest as a way to reduce the pixelation.

    I have a DMM, an oscilloscope and the service manual. The SM says nothing about adjusting the Vsetup or Vsetdn nor does it have a picture of waveform that seems to correspond to the Y-Sustain.

    Any suggestions will be greatly appreciated. Thank you.
    Last edited by Robb; 11-16-2013, 04:19 AM.
    Tags: None
    • capkid
      Badcaps Legend
      • Oct 2010
      • 1339
      • United States
      #2
      Re: How to adjust Vsetup and Vsetdn on Y-Sustain on 42HP66

      The LG panel alignment guide contains the info you need; I've attached a couple pages.

      The mal-discharge may not be corrected by adjusting the waveforms. Some have had success with adjusting the voltages slightly out of spec to get rid of most of the sparkles. Flashing the control board usually corrects the issue on these 42X3 panels:

      https://www.badcaps.net/forum/showth...=mal-discharge

      https://www.badcaps.net/forum/showpo...5&postcount=77
      Attached Files
      Last edited by capkid; 11-16-2013, 12:06 PM.
      LG Plasma Mal-Discharge Correction Service

        Comment

        • Robb
          Senior Member
          • Sep 2013
          • 159
          • USA
          #3
          Re: How to adjust Vsetup and Vsetdn on Y-Sustain on 42HP66

          Thanks for pointing me in the right direction. My oscope doesn't have 100V/Div or 100uS/Div settings so I'm not sure how to dial in the waveform w/o getting a different scope. However, I adjusted the other aspects according to to LG PLASMA QUICK REFERENCE ALIGNMENT HAND BOOK and the sparkles/maldischarge is barely noticable.

          I will keep the ROM flashing option in mind but for now the minor sparkles are sufferable. Cheers

            Comment

            • elbori77
              New Member
              • Aug 2014
              • 9
              • United States
              #4
              Re: How to adjust Vsetup and Vsetdn on Y-Sustain on 42HP66

              I have an Issue with my screen not align horizontally how can I adjust that?

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