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Dont mean to sound patronising , but not using the default options on the tvremote. Have you gone deep into the inbuilt on screen menu and selected sound and colour to make sure it had not been disabled or turned down, as those onscreen menu tv settings can over ride remote tv control options
Your TV color drivers could be at fault. They run very hot and sometimes develop dry solder. You can confirm this by hitting the side of the TV when its on and see if the color comes back. If they do or even flicker get somebody to resolder the CRT base pcb of the TV.
Codes is almost impossible to break,tries reset everythings in the menu setting,unplug for couple hours,just see if it reset itself,that all could do more than three years old tv not possible find reset codes.
If your screen has a picture in the left corner with a small square with lines on it but still has sound...try this....
unplug your TV itself from the power source, then hold down the power button on the tv itself for 1 minute, then release.... Plug the tv back in and see if the issue is resolved. I just called LG customer support and a woman walked me through this process and it fixed the issue !!!! Hope this helps..