Few days ago I got TV with following issue: there is no way to power on TV (only standby LED is on). I have checked that all voltages on IP board (power supply and inverter) were correct. Next I have checked key elements on main board. After analyze of schematic I have found guilty: it was electrical capacitor 100 uF / 16V (C5068) located near 1.2 V LDO (placed under metal shield near the MCU). After replace of this element TV works properly.