Aside from reader requests for a review of the
After about 1,650 hours of on-time logged on our
The 1,650-hour mark is somewhat significant because it's higher than the both the 1000 and 1500 hour marks after which, with Panasonic's 2009 plasmas, we measured losses. Our new results lend credence to Panasonic's claim that its 2010 plasmas would incorporate a "more gradual change in black levels over time" than the 2009 models.
That said, it's also true that the on-time for both of our samples still totals less than a year, and who's to say exactly when the MLL will increase. Panasonic's previous statements on this issue maintain that "background brightness will increase from its initial value" as part of the normal design of its plasmas. The company won't divulge exactly when those increases occur, or by how much, claiming that such information is a trade secret.
So all we really know so far is that the 2010 plasmas, based on our tests of two review samples sent to us by the company, show no black level loss after the first few hundred days of life. Unfortunately long-term testing takes, well, a long time, so we'll keep at it, and if we spot a change in MLL we'll report it here.
In the meantime, feel free to sound off in comments. Do these results increase your confidence in Panasonic plasma TVs, or plasmas in general? Are you still waiting for longer-term tests, or does this issue even register in your TV decision-making process?
Follow-up: Panasonic plasma black-level loss measured in long-term test (4/2/2010)
Tests point to extent of loss in Panasonic plasma black-level performance (3/2/2010)
Panasonic does not plan fix for reported black-level increases (2/9/2010)
Panasonic admits plasma TV black-level change but says picture quality still 'excellent' (2/4/2010)
Are Panasonic plasma TVs losing their dark black levels? (1/26/2010)