Picture still distorted and white

Need Help!!!. I've been trying to repair a Toshiba 50ul2063db. The TV was only 15 months old when it went faulty. The picture would not come through but still had a glow which told me the backlight was ok. After watching loads of YouTube videos I decided to replace the mother board but still had same problem. I then decided to replace the Tcon board, a picture did come through but it was white, distorted with horizontal lines and also the whole picture would flick from white to black every other second. I then decided to remove a ribbon cable from the Tcon board. The first cable was the left, the picture was dark on one side and white on the other but I could make out the app images when I pressed the home button on the remote. I then put that cable back in and removed the right cable from the Tcon board. The picture was distorted both sides.

. I have also cleaned the ribbon cables. The parts I changed were not brand new. Any help please

Still struggling to identify which panel is at fault left or right. I have tested the standard voltages on the Tcon board and they are all what they should be. Also I've checked the ribbon cables and there not in the best of condition see pics

If I take the right ribbon cable out of the Tcon board the right panel goes black and the left panel goes white but can see a slight image from pressing the home button on the remote.

If I take the left ribbon cable out with the right in, the left panel goes black but the right panel has a backlight glow with some horizontal lines

Which panel is at fault