Your power supply board is in need of repair. There is one capacitor that is bad. I just repaired this TV. When you remove the back cover, you will see the power supply board on your left. Take the board out. The capacitor (location number and value) C208, 1000mf @ 105 degrees is at fault. Replace with same value. After further testing of other capacitors, you will not have to replace any others. This is a simple repair, Thanks for asking, Matt of Martins TV Repair.
Fault to the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Line, faults & possible causes to LCD screen are given with illustrations. You can get an idea about the fault to an extent.
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.
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