Originally Posted by 0brf4n0
I'm trying to play this game, Gran Turismo 4, which supports 1080i mode (although it's a non standard 1080i signal).
Usually when I play a DVD or PS2 game in progressive scan (480p), when I go to the TV menu, I can switch between a 540p upscale conversion or a 1080i upscale conversion and it's obvious (the TV switches modes like a computer monitor). However, when I play GT4 using 1080i mode, and try switching from 540p to 1080i and backwards via the TV menu, nothing happens. Does my Toshiba not read the 1080i signal from GT4, or is it moreso the problem of it not being able to downconvert 1080i to 540p (so it just stays at 1080i and doesn't change resolutions despite the menu changes)?
I also have GT4 and I have experienced the same thing. Don't worry, this is not a problem. Let me explain:
When you have your PS2 (or Xbox or DVD player, or anything else) broadcast a signal at 480p, the TV then gives you the choice of receiving it progressive at 540p, or upconverted to 1080i....hence the *switch* when changing the option. When you have the signal broadcast at 1080i (GT4, Xbox, or upscaling DVD player), you're pretty much stuck with the picture as presented, since the TV is not gonna (or can't) downscale a 1080i signal to 540p....hence, no effect when changing the option. You should also notice that when receiving a 1080i signal, you'll receive an "Option not available" message (or something similar) if you try to switch the picture size (TW1, TW2, TW3, etc.). 1080i broadcasts (whether game, movie, or HDTV) are only displayed in the "Full" picture size, whether they are indeed full 16:9 or letterboxed/pillarboxed.
In other news, I'm happy to announce that I've just recently got an HD STB from Comcast, and literally had to pick-up my jaw from the floor soon after!!
I've connected the box with component cables instead of DVI->HDMI in order to dodge the possible "White-Glow" that I've read about here. All that's left for me now, is to await my future PWNAGE at the hands of the Xbox 360 and PS3.
BTW: I own a 30HF84 (refurbished) & (self-calibrated using Avia and service menu).....no significant problems to report at this time, other than slight damage to my jaw