I have replaced the screen, replaced the cable to the screen, replaced the back cover for the screen. The screen still has no backlight. I can faintly see the screen if I shine some light on it. I read (in a nearly 20 year old article) that it could be the lid closed sensor, but I can't even figure out where that is. Or it could be the inverter, also can't find that, probably integrated into the motherboard these days. Any thoughts of suggestions would be appreciated.
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Did you disconnect the battery from the motherboard before removing/replacing the display panel?
With the laptop turned on, check for voltage on the EDP connector pins 1-3 (display cable connector) and if is not there check if the FG2 fuse is blown on the board.
Here's an image from the NM-C811 motherboard schematic (if that is your board) that may help.
(click on image)
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