Asus X750JA-DB71 Laptop Screen 17.3 LED BOTTOM LEFT WXGA++

the laptop I'm looking to repair today is Asus gaming laptop model number g7 5 0 JW - DV 7 1 - CA the laptop is just over a year old one year one month I was doing work one afternoon I was working fine I came back in the evening and this is what I encountered the first thing I'd like to determine is whether or not there's a problem with the motherboard and the graphics card or whether there's a problem with the LED or the video cable so I'm going to plug the laptop into an external monitor one of the 4x3 footprint you can use a vg8 the VGA port my laptop happens to have a Thunderbird port so I'll be connecting the VHD input into a Thunderbird adapter thunderbolt adapter and plugging it into the side of the laptop we can see the four by three footprints showing up on the laptop if we take a look at the external monitor everything is fine there so the problem is not the motherboard or wit