Re: LG 42LK450 no sound or hdmi

LG TV have bad solder on the main board, This is my trick for many mainboard problems.
Place the main board in a preheat oven at 385 degrees for 10 mins. Turn off the oven and open the door a bit to let the oven and board cool. Then re-install the main and see if you issues are solved. I have been about 75% sucessful. ( What you have accomplised is a solder reflow of the main board. Good luck.