I thought i was going nuts until i realised you have the same problem. Until though i rang Panasonic and they tell me that the Xbox 360 runs in 60hz when in HD thats the reason why i dont get picture. The operator also told me that he had received several callls regarding the same Tv me and you have.
I Spoke to xbox360 hotline and they advised me that i could change the hertz to 50 in TV mode. By selecting PAL-50 in Display settings. I did so switch back to HD and again NO GO. I sincerely think that the 360 runs in 60hz when in HD and when looking around on the web apparently 50hz is the fastest a CRT tv can refresh in HD over 720P or higher. So it advised purchasing a PLASMA or LCD for faster refresh rate - (YES IF ONLY THEY TOLD US BEFORE...)
The best picture and same res as 1080i is changing your picture setting to 75/133. This will double the lines on the screen. Run the xbox 360 in TV mode but still use the composite inputs and you will notice that screen res and picture is just as good if not better then 1080i - 1920 x 1680 or so on. Notice the text of the games its much smaller and cleaner..
Let me know what you think...I hope i have made sense -
I Spoke to xbox360 hotline and they advised me that i could change the hertz to 50 in TV mode. By selecting PAL-50 in Display settings. I did so switch back to HD and again NO GO. I sincerely think that the 360 runs in 60hz when in HD and when looking around on the web apparently 50hz is the fastest a CRT tv can refresh in HD over 720P or higher. So it advised purchasing a PLASMA or LCD for faster refresh rate - (YES IF ONLY THEY TOLD US BEFORE...)

The best picture and same res as 1080i is changing your picture setting to 75/133. This will double the lines on the screen. Run the xbox 360 in TV mode but still use the composite inputs and you will notice that screen res and picture is just as good if not better then 1080i - 1920 x 1680 or so on. Notice the text of the games its much smaller and cleaner..

Let me know what you think...I hope i have made sense -

















The worst part about it though is that I have to explain my quick $500 loss to the wife. lol



