Display has low luminosity - looks like as burn backlight

Hello at all,
I have many days this problem with my laptop, I try to fix it but I can't.
Please guys help me to solve this problem with my laptop.
First of all, the problem is when I start my laptop, the laptop start and boot normally but the screen has low luminosity.
I think that looks like a clasical problem withn invert.
I change the invert in my laptop but the problem remains...
The next step which I try is the display, I change and the display from my laptop and I try it with new (and old invert) again the problem remains.
The third step which I try to do is to change the motherboard.
I change the motherboard and I try again but now with my old display because I send back the new display which I had bought from ebay. (new motherboard,new invert,old display--- the problem remains).
After all that tries, I try to change and the cable from the display but again I have the same problem.
My laptop begin normally, boot normally but the display has low luminosity.
In this point, I want to tell you that when I connect my laptop with external screen HDMI Monitor, it works great!
Do you something to suggest guys?
Please help me.
Thank you very much for your time...

Hello @Gratsa ,
To get your issue more exposure I would suggest posting it in the commercial forums since this is a commercial product. You can do this at Commercial Forums.
Even though this is a Commercial product, here is a link to resolving issues and check the display settings in the Notebook settings. This shows you how to calibrate your screen.
You can do a system restore. System restore will help if something automatically updated and did not go well on the Notebook.
Thanks.
Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
Click the “Kudos, Thumbs Up" on the bottom to say “Thanks” for helping!

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Message was edited by: Jerred Best
Message was edited by: Jerred Best

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