I just purchased an LG 55" 75 NANOCELL T.V about 10 day's ago. out of the blue on day 8 when I would switch from HDMI 1 to Live T.V the T.V would show the T.V broadcast for about 1 second and then the T.V would turn off. so I I did the plug unplug then I messed with energy saving features timers so on so forth on the LG, but to no Avail could not get it to stop shutting off when I would switch Inputs. so I am scratching my head??? I was to the point of returning the T.V to the place of purchase as I am still within the return period. So I think Maybe it's a CEC/HDMI power function issue on my Shield T.V Pro. "I am not sure if this is a random bug or not, and why I am posting this here." it may be an an LG and Shield T.V issue". So any way the "THE FIX" what I did was go into settings on my Shield T.V Pro , select Device Preferences, then select display and sound, then select Power control, I then ticked each option to off, and then reboot the Shield T.V and VIOLA!! no more issue with the input issue, I then went back into the BOX and turned each one back on one at a time until I could find the one preference that was causing the issue, "it was the option sleep shield when T.V input changes" that was the culprit.!!!! I hope this helps anyone that has had this same issue!! keep it off it's not needed for most
