when powered up my LG tv led flashes red 19 times then turns green, when it turns green the screen lights up slightly and is locked with no output available. I can hold the power button down for ten seconds or so to reset tv. does anyone know how to fix this. if i power on then off multiple times about a half hour or so i can get the tv to lock onto an input mode and the tv will work. but as soon as it is powered off it goes into standyb the fault abain. I have a 47LC7DF