I am from Ireland and I have been following this thread with interest hoping to find a solution for this problem. I have the European version of the PZ80. But it seems like there is going to be no solution. Anyway, Two days ago I got very frustrated with everything and tried to fix the problem myself. I use this plasma as a computer monitor too, and, whenever I opened notepad and internet explorer on a dark webpage then some of my icons on the desktop flickered like crazy. And sometimes on the xbox360 playing games I could notice flickering too, most of all on the cutscenes in halo3. And you know the way when you look at one side of the screen you can see the flicker on the other side? Yeah? Well that was really bad for me.
Why am I telling you all this? Because after getting mad 2 nights ago, I tricked and tinkered with the service menu and the picture settings. Since then I can barely notice any flicker and I haven't been able to get my desktops icons to flicker at all!!
this is what I did, remember it involves going into the service menu though!!
First I tried to make the room as near as I could to the brightness I most often use when watching movies or using the PC. Then I went into the service menu by holding down the V- button and pressing 0 on the remote three times quickly. you scroll through the various options by hitting 1 and through the various picture modes (like cinema, normal, etc) by pressing 9.
Ok when you are in the service menu press 1 once and there will be an option to change contrast, and further down you will see instructions on how to do things. If you press the yellow button on your remote it will find the best contrast ratio. Once it has done that use the volume key to change the value up or down by one. Then hit OK on your remote to write that setting to memory. Hit 9 then to change to the next picture mode and do the same thing again. I did this for all picture modes, except for ECO (which is called Auto in the service menu)
When you have done that, using the AV button on the remote and change to whatever HDMI or AV inputs you are using, and do the contrast adjust for each mode again. Repeat this for every input you are using. You might get strange colours when adjusting the HDMI inputs, but don't worry about it. and remember to hit ok each time you make a change so that it writes it to memory.
When you have finished physically switch off the TV and then turn it on again.
Ok, then you need to reproduce the flickering/strobing if possible. If you can't reproduce it or you notice a big reduction in it, then you can stop because I think that's the best you can get. But if you are still getting the flickering then open up the menu and go into picture options. then adjust the sharpness up or down until the flickering stops. Repeat this for every input that you have the flickering on. For me it was a different sharpness for each one. I had orginally the sharpness turned down to zero on all inputs.
Now, I don't know which of the two things reduces the problem!! So maybe if you are nervous about going into the service menu just adjust the sharpness in the picture menu and see if that helps. For me, it was a combination of the two as I had to look hard to notice the flicker after adjusting the service menu.
LOL of course I can't promise that any of these things will work for you. You have the American version of the TV, so maybe the firmware is different, I know your picture menu is different. It worked for me and I am now really happy with my TV again