Answer to: My LG TV 55lv5500 suddenly turn black with no sound or picture.Hi. I had the same trouble on a 42LX6500. TV powers on, but no video, backlight or sound. Nothing. Checked voltages and power-on signal as explained by oldturkey03 but voltages were correct. So, I decided to reflow LGE3556C under brown heatsink and it is working now. A professional reballing should solve this definitely.