Area-51m, blacklight - DIM problem

Dear Dell or Anyone,

I am reaching out to seek professional assistance regarding an issue with my laptop screen.

The screen appears to be extremely dim, and I can barely see anything even under a bright light. It seems that the backlight might not be functioning correctly.

Here are the details of the troubleshooting steps I have already performed:

1. All software, including drivers and the operating system, is up-to-date. 
2. When connected to an external monitor, the display on external monitor works perfectly.
3. I have conducted self-checks and diagnostics (including an LCD test), and everything appears to be fine.
4. The LCD screen has been replaced previously but not solved the question (cabels too).
5. I have tried removing the memory (RAM), battery and reinstalling it (or without or with), but it didn’t resolve the issue.

Given these findings, I would appreciate your guidance on the next steps to resolve this problem.

I have seen the dell instruction but till noone couldnt give normal answer - DIM is on 100% and scale is working.

Thank you for your support, and I look forward to your reply.

Best Regards,

Dex

Laptop: Alienware area51m r2 i9, Nvidia2080 / Intel....