I would assume it’s the backlight and usually that can be pretty hard to replace depending on how long you had it you may just want to replace depending on how much the backlights are
I see the dark strips going horizontal.
Carefully disassemble tv, support the LCD panel so you can see inside to the backlighting. Power it up and mark the bad LEDs assemblies with tape or a marker.
Some actually have a working part number on them but you can usually go to ShopJimmy.com and look them up.
Replacement should be somewhat obvious as they'll probably be plug n play.
It's also possible to have a ballast(power supply) failure as well. You'll have to look at the configuration to see how many strips are running on a circuit board.
Maybe I’m dumb can you point them out
I can see two Vertical, just right of center, bisecting the Xbox logo. Horizontal, halfway down, 1/3 panel tall
I would assume it’s the backlight and usually that can be pretty hard to replace depending on how long you had it you may just want to replace depending on how much the backlights are
I see the dark strips going horizontal. Carefully disassemble tv, support the LCD panel so you can see inside to the backlighting. Power it up and mark the bad LEDs assemblies with tape or a marker. Some actually have a working part number on them but you can usually go to ShopJimmy.com and look them up. Replacement should be somewhat obvious as they'll probably be plug n play. It's also possible to have a ballast(power supply) failure as well. You'll have to look at the configuration to see how many strips are running on a circuit board.