I have disabled all ECO controls, but no change.
Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
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Did you get this issue resolved as I am having the exact same issue with the same TV. Replace the power board and still no resolve.
I wonder what it could be
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