TV won't turn on - red light on unless I unplug power board from tcon

I've been working to get an LG OLED65G2PUA working again. The TV shows a red light when plugged in and three blinking lights when the power button is pressed down. I tried testing the panel by unplugging ribbons to see if parts of the panel would come on. No change still blinking red light. When I unplug either of the connectors highlighted in the picture I can hear the power board click and then turn off and no red light. Is this a sign of a bad panel or bad power board?