Chosen Solution
I have a Toshiba 50UL2063DG Android TV, and it was working fine until lines started appearing on the TV, these were basically unnoticeable at first, but a while later, they started getting worse to the point where the lines would start flashing. This covers a large part of the display. Right after turning on, the TV is fine with just a few lines, but after just a few minutes, the lines cover most of the screen and flash. I have done some research and suspect a T-Con board problem, but I’m not sure.
@ElectricShock the boards look good and I checked them against some other ones and does not look, like any burned or missing components. The only boards I have nothing on are the LED driver boards. At this time, the only thing I would try is to replace the main board and see if that makes a difference. Get an inexpensive used one to try it out. The Vestel board is really not the highest quality and all the boards have been used on JVC TV’s and other less expensive models. So, anything is possible. For more info on that board, check this Vestel 17mb170