Looking at the pic, it's sort of tough to tell, due to the lack of RF signal presence, hence "snow" on screen. I'd guess from the irregularity of the shape, that the backlight tubes in that area aren't fully illuminated. I say that because you can see the tcon addressing is somewhat working because the snow is present beneath the haze. But that wouldn't cause the green haze condition. Is it safe to say this condition exists on all inputs? The green is typically indicative of loss of digital signal, but, again I can still see snow beneath it. If you get right up to the display in that area can you see that all 3 sub pixels are lit? If you can find a tcon cheap on somewhere like shopjimmy.com, i'd try it. Worth a shot.
If the inverter boards are interchangable, I'd also try swapping them and see whether the problem moves to somewhere else on screen.
Hope this helps some, good luck.