Hi @Bradfords random channel,
Try shining a torch at an angle close to the screen to check if there are any images at all on the screen when the laptop is on and there are images on the external display.
They will be very faint if they are there so trying this in a darkened room may help.
If you can see images then there is a backlight problem. You would need the schematics of the motherboard to determine whether the problem is on the motherboard, the video cable or in the LCD panel. Try searching online for (insert motherboard ‘board number’) schematics to hopefully find the schematics. If you do find the schematics then if the problem is on the motherboard you may be able to fix it. If it is in the LCD panel then the panel will need to be replaced as it cannot be repaired. If you can’t find any schematics for the motherboard then as a DIY repair all you can do is to replace the LCD panel and check if the replacement works OK
Here’s the maintenance and service guide for your laptop series.
Go to p.91 to view the necessary pre-requisite steps and then the procedure to remove / replace the display assembly.
The procedure will allow you to gain access to the display panel cable on the motherboard so that it can be checked that it is secure and also that it is not damaged where it passes through the hinge to get to the lid etc.
The LCD panel part number is found at the top of p.91.
Search online using the part number only, appropriate to your particular laptop, in the search term of your browser to get results for suppliers of the part.
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