When I reviewed Panasonic's entry-level 2009 50-inch plasma TV back in April, the TC-P50X1, I mostly liked what I saw aside from one strange issue: the screen showed faint diagonal lines seemingly embedded in there. See the bottom of this post if you're interested in the full description from the review.
Fast-forward to late July, more than halfway through the product's lifespan, and it seems Panasonic has fixed the problem. The company sent yet a third TC-P50X1, and it didn't exhibit the diagonal lines.
That's all well and good, and Panasonic deserves credit for finally addressing the problem. But questions remain, and Panasonic has not been forthcoming.
On August 12, I asked the company a series of follow-up questions, including, "Exactly when did the change get implemented? Did the 42-inch model have the same problem? If so, was the same change implemented? Is there any way for a consumer who's shopping for an X1 plasma to tell whether the panel is an old one or a new one, aside from looking directly for the diagonal lines? Is there any sort of serial number cutoff? Can current owners who have the old, flawed panel exchange it for a new one? If so, how?" and, "Please provide an explanation of what the lines were and why they're present on the old one and not the new one."
What I've received in response after a week of waiting for a reply was pretty unsatisfying.