Samsung UN65MU7600F vertical lines. No meaningful image.

This is Samsung 65, curved 4K TV UN65MU7600F

Got some panel damage but it was working fine since, as damage is isolated to small portion of right corner. One day when we power it up showed up like this ! ( see photos )And we cannot get to work since.Nothing connected still same story. Lines are changing when something is connected ( Chromecast or Laptop ) or poking with remote and showing Menu for example.

I re-seated all ribbon cables, cleaned up connectors as well. Poked around panel ribbon connectors hoping there is some breakage but no luck.

TV is alive it reacts to remote and when laptop is connected picture is changing when I poke with mouse.

Also I have done TV factory reset blindly :D it also produces sound.

!!! I do believe this is NOT due to cracked panel as it was working fine for years !!!

I've seen some posts suggesting to check resistors on LCD interconnect boards.

What do you guys think about this fault ? Can I fix it ? Anything else I can try ?