Ever seen like this with plamsa problem?

[Wizard]

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

[PowerAmpFreak]

Re: Ever seen like this with plamsa problem?

What brand and model?

[Wizard]

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

[PlainBill]

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

[Wizard]

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

[PowerAmpFreak]

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.

[cadiman]

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?