Laptop graphic chip, LCD, inverter or video cable problem?

[noctornus]

Hello everyone!!!
I have a Dell XPS m1530. When I turn it on, screen wont work, not even a ghost image or backlight on LCD.
I tried it on external VGA monitor, and it is working normally, I did some tests while it's on external monitor on nVidia graphics with FurMark testing software, it was working for a half an hour until I stopped it, eveything normal.
http://i1290.photobucket.com/albums/b523/noctornus/IMG_1123_zps18a080e5.jpg
Also, it shows normally on nVidia control center and in Device manager. (I uploaded some photos)
http://i1290.photobucket.com/albums/b523/noctornus/LT XPS/IMG_1128_zps2faaf72a.jpg
http://i1290.photobucket.com/albums/b523/noctornus/IMG_1125_zps23cbadf6.jpg
http://i1290.photobucket.com/albums/b523/noctornus/IMG_1127_zpsd20dc7c5.jpg
I tried to boot up with D key pressed (LCD BIST test), it does change colors on LCD.
I also tried Dell diagnostic problems, it shows error in picture link bellow
http://i1290.photobucket.com/albums/b523/noctornus/error_zps092a6c77.jpg
Can you guys tell me what could be a problem?
Does graphic chip works for sure (because this model have known nVidia chip problem)?
If some of those work, how I can test rest of hardware to determine what is wrong?
Thank you all in advance!!!

 

[carnageX]

The GPU is fine since an external monitor works.

You can find out by turning your computer on and shinging a flashlight at about a 45* angle at the screen, and look if you can see a display. If you can see a display..then it's the backlight.

If there's no display at all, then it's an issue with the screen and you'll need to get it replaced. To replace it, you should be able to find one here: LAPTOP SCREEN from $34.99, replacement LCD screens. Repair Tablet, Acer, Apple, iPhone, iPad, Samsung, Dell, HP Compaq, Toshiba, IBM Lenovo, Sony, Asus, Gateway.

The site is legit (sounds sketchy just because of the generic name, I know) - I've used it several times, and their customer service is fantastic.

 

[noctornus]

Does LCD BIST test (color changing on display) means that inverter and video cable works?

 

[noctornus]

The GPU is fine since an external monitor works.

You can find out by turning your computer on and shinging a flashlight at about a 45* angle at the screen, and look if you can see a display. If you can see a display..then it's the backlight.

If there's no display at all, then it's an issue with the screen and you'll need to get it replaced. To replace it, you should be able to find one here: LAPTOP SCREEN from $34.99, replacement LCD screens. Repair Tablet, Acer, Apple, iPhone, iPad, Samsung, Dell, HP Compaq, Toshiba, IBM Lenovo, Sony, Asus, Gateway.

The site is legit (sounds sketchy just because of the generic name, I know) - I've used it several times, and their customer service is fantastic.

Thank you for helping me. A few answers on other forum, regarding my problem, was that "it is possible for laptop to work normally on external monitor with having bad GPU-nVidia graphic chip".
It looks so weird to me, because what could process those images on VGA if GPU doesn't work? It is so hard to diagnose problem if that can happen.

 

[carnageX]

I would only say that could be an option if it has dual graphics. I.e., integrated + dedicated. Usually called Optimus when integrated Intel is paired with nVvidia.

Sent from my HTC One

 

[noctornus]

I would only say that could be an option if it has dual graphics. I.e., integrated + dedicated. Usually called Optimus when integrated Intel is paired with nVvidia.

Sent from my HTC One

I think thats not the case with Dell XPS 1530, think it's only on nVidia graphic chip.
If that graphic chip works then the only bad think can be video cable.