No tech will tell you what it is since they need to see the set (not just a video) but the common cause is a main board failure and sometimes the panel or other parts. If you find a good depot or shop they will estimate it for you. The fact it works cold tells me it's more likely to be one of the main boards in the set. It's not conclusive. Parts and Labor and a guesstimate pegs this in the 200-400 USD range to repair.
My 42lg3000 has developed a problem with the colors.
see here: https://www.youtube.com/watch?v=5plwgNLz84k
when i power on the tv, after it was off for a few hours, the image is ok for a few seconds and then it changes colors and lines/banding appear
it is now a input issue as it is present in the tv menus and on antenna input too
i updated the firmware but the problem is still there
Can someone tell what is the problem and if it worth repairing?