Bad Screen Laptop Screen - showing blue lines instead of black

I have an old laptop HP Pavilion DV7-1448dx, the screen shows blue lines instead of black. I tried using TV as a monitor and it doesnt have any problem, it only shows on the laptop. I replaced the LCD screen with a brand new screen but it still shows the same problem. I attached the pictures of what my screen looks like. It only shows this on the black color and the others are ok. Pls help!

@luv2travl ,
Hello and welcome to the HP support forum. Thank you for posting about your display issue.
It sounds as if the RGB output of the graphics card has become a bit off in your case. You have replaced the screen so the output that supplies the LCD from the graphics card is the issue.
As you stated on a VGA output to a TV it looks normal. Therefor it isnt the card totally having the problem.
Here is a link you can check out on display issues.
Display Quality Issues
Here is a link to your systems Maintenance and Service guide as well. One thing you may want to check is the actual cable that connects the screen to the motherboard. This is the easiest and cheapest part to work with.
If you replace the connection cable from the motherboard to the monitor this may fix the issue.
HP Pavilion dv7 Entertainment PC Maintenance and Service Guide
Please let me know how thing go with this.
Thank you again for posting and have a great day.
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
D5GR
I work on behalf of HP

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