Hi, working on ASUS UltraBook UX403U, it boots up fine but there is no Backlight. I can see the dim image in the background but no Backlight. I checked the Lid switch & is working fine. Replaced with known good LCD screens, still the same. I measured voltages, 19v is present on pin 1~3, but do not get the 3.3 volts. Does anyone have the schematics or the boardview so that I may know the pin-outs?? On board it has the 30-pin LVDS connector. Thanks of help