I am trying to diagnose where my LCD backlighting issue is coming from, as all components from the LCD flex connection cable, LCD inverter, LCD & LCD backlight, are in perfect working order, when tested from another unit. It's a Sony Vaio VGN-NR series model VGN-NR350f & both VGA, HDMI external monitor ports are in functional condition still. So I'm completely at a loss for finding the cause to the backlighting issue. Does anyone know where exactly the power to the backlight inverter is delivered from & if this is repairable without having to replace the entire motherboard since the VGA chip is integrated to the board? Thanks for any input on this matter.