I have an LG 55ls4500ud that I replaced the power board and t-con board. The backlights and picture work on left half. The right half has 2 different shades of grey vertical blocks and it mirrors the image on that side. I checked the drivers and they look fine. Any ideas what it is? Main board/IO board? I've also alcohol all connections and checked continuity on ribbon cables all fine where should I go next? Thanks in advance. I'll post a link to pic.