I found another video that talked about replacing EEPROM to fix the problem. That seems more difficult that I'm willing to try. I'm hoping to confirm that replacing the T-con board has a good change of solving the problem.
Do a reset to this set, and check. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
Service mode entry, adjust and exit procedure to many popular brand TVs are given. Never forget to exit the service mode, after all adjustments have been done.
Testimonial: "Hard reset has no effect. Also, could not get into service mode. Should I try replacing the T-con board?"
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