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Ever seen like this with plamsa problem?

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    #1

    Ever seen like this with plamsa problem?

    All power supplies working, no fuses blown and getting waveforms of some kind but all heatsinks on Y-SUS, Z-SUS and X-SUS are cool, no picture at all or no dim glow at all. Even checked LVDS waveforms and are there. I had tried a new logic board with no luck.

    I put estimate for plasma panel replacement.

    Want comments. This is one stumps me. I not had this like that before.

    Cheers, Wizard
    Tags: None
    #2
    Re: Ever seen like this with plamsa problem?

    What brand and model?

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      #3
      Re: Ever seen like this with plamsa problem?

      Does not matter, many plasma panel makers are same in concept on how plasma panel is lit up. I was asking ever seen this before? I have no idea what it looks like if panel gone up to air. Remember it has bit of gases and mercury vapor.

      Cheers, Wizard

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        #4
        Re: Ever seen like this with plamsa problem?

        I've never seen it before, and in spite of reading several training manuals, I don't have a good grasp of where the power is dissipated. Obviously, a significant part of it goes to generate the plasma discharge. But I would think that driving the various electrodes at high frequencies would also dissipate some power.

        The only experiment that comes to mind is to take a working plasma TV and providing the signal for a pitch black screen. If the heat sinks stay cool, you have demonstrated that the symptoms match a vented panel. If they still heat up about like a working TV, it unlikely that a vented panel is the problem.

        PlainBill
        For a number of reasons, both health and personal, I will no longer be active on this board. Any PMs asking for assistance will be ignored.

        Never be afraid to try something new. Remember, amateurs built the ark. Professionals built the Titanic.

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          #5
          Re: Ever seen like this with plamsa problem?

          Plasma needs to be just at pre-charge level (hence the very dim lit) on black. The heatsink will heat up but not as much. I can tell by careful look and this TV with this problem did not light up dimly even with no signal from LVDS. BTW: Full white is full load.

          Cheers, Wizard

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            #6
            Re: Ever seen like this with plamsa problem?

            Wiz, do you have a power consumption meter on hand?
            Hook up the plasma through and measure power. This will give a clue if there's more powerdissipation than you think.

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              #7
              Re: Ever seen like this with plamsa problem?

              You need the tvs history from the customer and their kids will never tell them what happened. brand of pdp please?

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