Originally Posted by Rpresner
the reason is that if panasonic has specified hours on when it happens and lets say your set happened before that, would that not be a defect? I forget who it was, but I remember seeing something way back that stated 600 hours. Someone posted an actual document.
The document was a patent, I think it's linked in Orta's first post now.
The patent describes exactly why the voltage should be increased to compensate for aging plasma cells. But keep in mind, the patent uses generic diagrams for illustrative purposes. It's unlikely that Panasonic would include their actual voltages and hours in a patent. (they didn't patent the values, they patented the concept)
Based on the chart data (in my sig) the panels that got measured before 500 hours mostly exhibited a rise in black level. There's still no concrete answer on when it happens.
BTW: Looking forward to your measurements... Thanks for getting a meter.