If it was me, I would at least map out the basic's of the PSU section inside the screen, and make sure enough power is getting to the LED's. It looks like some are working. Most of the voltages are probably ok, but it could be that running all the lights, some PSU section has a problem and can't keep up.
If you track back from the LED's to some voltage rail, and then some regulator/controller IC, you might find it's datasheet and see if it's putting out the right voltage.
Of the 2-3 monitors I've worked on that had a 24V external power brick, they still had a few step down converters and regulators inside for the various chips, and in those monitors, some PSU section for cold cathode Florescent lamps.
I have a broken TV, that displays nothing, but the PSU section seemed good, So I guess it's the LED's gone bad, but IDK what replacements to get, or if it's worth it. I bet I'd get it full of dust, taking apart the actual panel. And then those things are tricky to take apart and reassemble.