I had the XB1 hooked up to a flat panel HD 720 LCD TV and it worked great. I moved it to the basement and hooked it up to a Mitsubishi WS-55515 HD 1080i rear projection TV w/ HDMI input. The XB1 will only output in 480 and the picture is horrible, very dark & grainny. The XB1 will not "auto detect" so I manually set the XB1 to HDMI & 1080 - even tried 720 - but the XB1 reverts back to the horrible 480. Ive been thru the set up menu for the TV & XB1 with no resolve. I ran the DirecTV thru the HDMI input to verify the TV's HDMI input was ok. I switched the HDMI cable to rule out a bad cable. I am a A / V tech so I have an idea as to what Im doing. Ive set up several XB1's but never to an older HD TV. This TV is from the early 2000's.
My thoughts are the XB1 cannot "communicate" with the older TV like it does with the newer flat panels so it reverts to the 480 resolution. I dont get why the 480 picture is so bad. There is also a cable feed to the TV and its 480, it looks fine...for 480 anyway.
Any thoughts would be greatly appreciated.