I will talk about Panasonic TC-L42U25 42-Inch LCD HDTV
I bought Panasonic TC-L42U25 3 weeks ago. It was very easy to integrate it into an existing home theater set up. The picture was very dark from day 1. I found the filters in the Menu and turned them off and the picture improved nicely.
But I found that everything on the screen was too green. No matter how much I fiddled with the available color menu I couldn't get the green out.
I contacted and chatted with one of their CSRs. He walked me through a reset of the TV that wasn't available in the Menu. It involved pushing the menu button on the remote while holding down the volume down button on the TV, then unplug the TV for a minute or so. This did reset the color in the TV and I now have a beautiful picture.
A few days later the TV began shutting it self off every 3 hours. I haven't used any timers in the menu so I may have to contact Panasonic again. Panasonic was very helpful with my previous color problem so that is a great relief. I am wary of the software for Panasonic TC-L42U25.
I also found the Viera link through HDMI that controls linked items like a DVD player can be a problem as it can or will reset the linked item from what it was originally set to on the items remote control.
I shut off the Viera link and the problem went away. I have always liked and bought Panasonic products for their reliability and quality but feel somewhat let down by the issues I have had so far.