oddly enough my CCC is missing at this moment ( dont know why)
in advanced settings not basic there will be a my flat panel/s tab. in there at the bottom i do believe there is an enable hdtv settings. in there there will be some 720 settings at different hrtz ratings and it will give you the warnings and whatnot. choose your poison in there so to say but you are going to know right away which settings the tv does not like and i myself like to be right quick on the revert setting. if the screen goes blank just turn the set off and do nothing for a minute. CCC will revert in 30 seconds if you do nothing.
now also did you lcd not come with a cd as a manual?
it might be in there that you will find info on what YOUR set likes the most
I am off to find out where my CCC went