Hey there, I happen to have the about same symptoms. Plug in the TV, it starts, shows me a very crisp picture for about 20s, then first goes black with lit backlight and then reboots and with each reboot the on time decreases rapidly. Unplug it for 10s and rins and repeat.
When I unplug the ribbon between the two LCD boards, it stops cycling, but does not show a picture.
I glued of everything besides pin 1 and 46 as somebody noted. This caused the TV to only show a picture one third of the screen and quite a bit more distorted than usually, and still shuts down after a few seconds....