Chosen Solution
TV: LG 70UM7370PUA
This wave-like pattern shows up permanently on my TV when it’s on. Its intersection with the edge of the TV makes it look like it’s really popping out from the TV, but it’s completely invisible when the display is off. It makes me think it’s a backlight issue instead of the panel itself. It seems like the same issue as this TV: https://www.avsforum.com/threads/is-my-n… I’m open to opening up the TV to see if I can alleviate the issue, as this TV is already out of warranty.
Someone helped me figure out the problem (in my cross-post of this issue) on Reddit: https://www.reddit.com/r/TVRepair/commen… The issue was that there’s a diffuser sheet (which scatters the light from the backlight uniformly on the LCD panel) underneath the LCD panel that was warped. I tore down the TV until I could reposition the diffuser sheet and tried to smooth out the hump. Unfortunately it was creased so I couldn’t eliminate the unevenness entirely, but I was able to minimize the ripple effect as much as I could (without replacing the diffuser sheet outright).
