Een beetje onderzoek geeft:
I just bought a LG 55UHD61. When I try to turn it on, the red light will go on, but the screen will remain black. When I push ANY button, the red light flashes 3 times and then goes off. I tried with unplugging the TV for 6 hours and then plugging it back again, still nothing.
I had the same problem after a lightning. Changed the main board(cost was £45) and solved it.
More than likely the main power supply circuit needs repair. These TV's have a tendency to burn through the main capacitors on the power supply board it's been a known problem for awhile yet they continue to use under rated caps. There is typically four of them usually the four biggest ones on the board all you have to do is replace them with new ones of the same capacitance value but of a higher voltage usually ones rated for 16v will do the job and you can even substitute with an even higher voltage rating so long as the capacitance value is the same as OEM. Good Luck
Dus daar ligt waarschijnlijk het probleem. Even een onderzoek aanvragen bij LG dus. En is er nog garantie dan mogen ze het sowieso oplossen,