Latitude E6510 display not working. White screen with lines

Hope this helps. I have a Latitude E5410 that I bought knowing that the LCD had a white screen or whiteout or high contrast issue. I verified that moving the entire display panel or warping it slightly could cause the whiteout to disappear, leaving me with a normal display. But I had to "hold my mouth just right" OR I could lose the visibility and have the whiteout reappear. I did troubleshooting starting at the LCD cable connection to the motherboard. I removed the LED/hinge cover and the keyboard screws. I started the computer and put into Setup (BIOS). After I had screen contents, I removed the keyboard and wiggled the LCD cable connector. It was seated well. I replaced the keyboard and removed the front display bezel. I wiggled the display cable DC7TY at the little LED board but that did nothing. I turned off the computer.

I unscrewed the 6 screws holding the LCD panel and hinge supports to the display top cover, exposing the back of the display panel itself. On the right side, low on the panel, I peeled back the 1/4 x 3/8 adhesive on the clear plastic covering the panel circuit board, exposing the flex cable  going to the backlights. I flipped the little brown lever that held the flex cable connected into the socket connector, pulled out the cable, moved it in and out several times to repeat it, then flipped the lever to hold it. With the LCD panel in this exposed fashion, I started the computer and entered Setup. SUCCESS!!  No amount of wiggling or warping brought back the whiteout. I buttoned up the computer and came here to report successful findings.

Your Dell may be different but you can report whether your symptoms or findings are different and HOW EXACTLY you became successful. Cheers!