it's my first time trying to dismantle a 55" tv and i want some help with useful methods to prevent the lcd to broke

its a daewoo uhd55

I have a xioami X43 43 inch 4K 2024 TV since purchase it has random reboot issues which service center denied because during their technician visits it would run great

Fast forward i was managing it all until yesterday the TV gave up:

MAIN THING

First it showed green lines all along the screen and started rebooting on the Google TV logo it showed purple lines all along the screen I shut it off

When I tried turning it on again later that day completely dead

Only the white light remains static on the power button no display no nothing

So this is what my Samsung 65” displays. From researching this type of image, I’ve seen similar issues declared as backlighting failures. Is that what is going on here? And if that’s the culprit, do I need to buy a complete backlighting set to properly repair this TV? Any guidance in getting pointed in the right direction would be greatly appreciated!

I finally had time to take a good look at my parents TV that was having issues. I have some pics to show what I've tried to troubleshoot it so far. First pics are with both ribbon cables connected to tcon. Image gets more blotchy and washed out over time. Next with left side disconnected. Last set is right disconnected. It works perfectly on half the screen with the right side disconnected. Could this be the tcon or ribbon cable? No physical damage to the unit.