ASUS UltraBook UX403U no Backlight

**mferna14** · 03-28-2022, 04:35 PM

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

03-28-2022, 04:35 PM	#1
mferna14 Badcaps Veteran Join Date: Jun 2018 City & State: Brampton My Country: Canada I'm a: Knowledge Seeker Posts: 488	ASUS UltraBook UX403U no Backlight 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

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