Except for the LCD panel itself, everything else (the controller, PSU, wire harnesses, connectors, etc) are already easily serviceable. If you can build a computer, you can service this display.

A big bonus with my industrial design would be that the casing itself is made out of metal and harder to damage than plastic casing of most large format displays.

For your specific case, is that a consumer grade panel? What issues are you having?

My LG display went black. The panel itself was working fine because the logo shows up when it powers up. When I checked online it said it’s the controller. I looked into the cost of replacing it - it was more expensive than the price I paid for the tv itself. Ended up replacing the tv entirely.

I don’t care much about the panel issues - a few dead pixels I can live with and anything worse I’d rather replace it. But everything else should be easily swappable.

Also, I’m assuming you’d at the minimum support HDR and preferably Dolby Vision and Atmos. How easy/hard is that?

I believe that consumer grade displays are inherently designed to be replaced vs serviced whenever they go bad. But, if your mind is wired-up to learn more and tinker with things, you can generally figure out a way to prop it open and fix it yourself. I don't know much about your exact LG model but I am pretty sure you could drive it with another more generic controller off AliExpress.com. What makes consumer grade displays a bit more interesting is that they generally come with the audio component. If that wasn't a big concern, you could easily drive it using another generic controller or an LVDS compatible mini-itx motherboard.

Awesome! Yeah it’s a super thin, dumb TV and other than the fact that black shots always revealed some inconsistent lighting on it it’s decent. The recent problem is that once in a while a vertical segment (probably 1/5 or 1/6 of the width of the screen) is discolored and mostly black.

Well, any LCD panel requires 2 things to work: a controller and a power-supply/inverter specifically designed to light up the display LEDs. In consumer grade displays, these components can be 3 different things (ie controller, psu, and inverter) and are fairly cheap to replace. You can generally find them on eBay. The only way to really damage an LCD panel is by dropping it and if that is not the case with your display, you can bring it back to life by identifying which of the 3 components might be bad and replacing it. Don't be scared to get surgical with your display. In the end, you will most likely learn more than you will regret.

If you get weird colours or it's black but fully lit up, then its the TCON board (the LCD controller). These are easy to replace as they're usually on their own board and you can just swap it out for a new one.

If you get the full image but its dark (you can hold a flashlight to the panel to see), then it's the LED strips. You simply take off the panel and replace the strips that are broken (though you should probably just replace them all). Fairly easy to do.

Rarely it could be the PSU that drives the LEDs, but that would usually mean the entire screen is dark.

TVs are actually quite nice to work on. They usually have big circuit boards which are nicely labeled and enough space that you could easily replace a capacitor or two with a soldering iron. :)