Dark Shadow left side

Issue with Dark Spot on the Left Side of My 75-inch TV

Hi, I have a 75-inch TV, and for some time now, I've noticed that the Left side of the screen is darker than the rest. While the screen is still visible, that side appears much darker, and the contrast looks off.

I thought the issue might be with the backlighting, so I replaced the LED lights behind the screen, but the problem is still there. I'm not sure if it's related to the backlighting or if there's a fault with the panel itself.

Has anyone else experienced something similar, or does anyone have any idea what could be causing the uneven brightness on one side of the TV? I'd really appreciate any advice or suggestions on how to fix it.

It's a Hisense 75h6510g, 75Inchs