Chosen Solution
I have an LG 40 in. tv and half of the screen is flickering and sometimes it has vertical lines in it…..would it be cost effective to repair…..
You can try re-seating the ribbon cables coming out of the T-con board that go into the panel. If that does not get better you have a panel that is going bad and it will be uneconomical to repair unless you have access to free screens. You might try to replace the T-con, depending on the cost and if you can return it(minus a restock fee), but my experience is that 90% of the time or more it is a panel problem.