It definitely sounds like a backlight issue, but check the display connector again. I had some weird video problems with my AMD main board when I upgraded, some of which sound a bit like yours. It ended up being a speck of dust or something in the connector. Once I blew that out with some canned air and reseated the connector, everything worked properly. Worth a shot at least.
this post was submitted on 17 Nov 2023
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This isn't a brightness autoadjust thing. Looks like your backlight is out.
An LCD screen that is actively displaying an image but with no backlight will still show a faint image from reflected light, so you can see an image in a lit room but not in a dark room.
Check the connection on the motherboard and also check the connection that connects directly to the LCD