Before considering replacing the screen, check out the following ideas
It could be the display inverter instead of the screen itself. Some computers use something like a backlight converter instead of a display inverter. Those are units that feed from the motherboard up into the screen
--- Check your computer manual to determine which part you computer uses.
--- When I see the symptoms you describe I usually tap the hinge section, move the screen somewhat a little lower and higher and one time I used a clean power towel to gently wipe the screen (not to clean it but to observe how the display is affected).
--- The intent is to see if the problem essentially corrects itself as pinching wires or some defections in those units are the probable cause
On my sons laptop, tapping the hinge sections was the solution 3 years ago and the problem never returned although it took him about 6 times of tapping the hinge section before the problem went away
A few other times I called up DxDiag and ran the tests in the display tab section. If you decide to try this, take the time to let each test complete itself
Asyou can see, I don't use a step-by-step troubleshooting procedure but a trial and error method as I haven't found a step-by-step method yet
I just picked up a couple of used laptops that have major problems for free and I'm going to use them to experiment on how to remove a screen so I'll get the experience on how to do so
--- I have 3 laptops and I'd be leary about spending the time & money on replacing the screen on any of them without having gained some experience