I have a TCL Roku 43" tv that has no picture or sound with vertical lines. I have replaced the main board which solved the no standby voltage problem. I have checked all the voltages on the T-Con board and they are ok. I suspect the VGH voltage is not present on the 2 panel boards but i can not find any marking where this voltage is identified. I am attempting to trace the VGH voltage thru the ribbon cables but need the pinout.