Here's the deal:
I have an older Xbox 360 (white with 30GB HD) that has the trapezoidal shaped output for either Composite or Component. I have been using it via Composite (red/white/yellow) on an SD TV (480i) for some time now due to ease of use.
With Halo 4 coming out soon, I want to play it on my 55" HDTV (Sony Bravia model# KDL-55ex710) for the full effect. I transferred the Xbox 360 over and ordered an HD Component (red/white/red/blue/green) cable since my older model doesn't have an HDMI output. I popped in Reach, and the resolution and image of it looked quite wonderful. It was running 1080p no problem. The only problem is that there was about a 0.5 second input lag with the haptic feedback. I pressed the A button, and my Spartan jumped 0.5 seconds later. It was extremely agitating.
I switched back to my SD TV since there is input lag whatsoever, but now yearn to play on the HDTV for Halo 4 due to the amazing graphics, larger TV, and, I mean, come on, it's a 55" HDTV.
My question is: what can I do to reduce or completely eliminate input lag on the HDTV? From the research I've conducted so far, I've found that a "Game Mode" on the HDTV eliminates a lot of the background video processing, but my Sony Bravia doesn't have one. I've also asked myself if upgrading to a new Xbox 360 (black one) and use the HDMI output (since it's a digital cable instead of optical) would reduce or eliminate the input lag, but have found that that wouldn't produce a noticeable difference.
Does anyone have any suggestions or methods that they use personally? I would love if an avid techy could supply some recommendations!
P.S. The Bravia has 120Hz Trumotion, if that tells you more about the refresh rate.
TL;DR - How do I eliminate input lag on an HDTV for gaming?