Check input or source
Checked LED back light voltage in power supply board if its ok checked back light strip.
SOURCE: Screen shows several horizontal and vertical lines.
Press the menu on the TV and let me know if the menu is effected. If the Menu if effected , you can try unplugging the power cord for a minute and replugging it back. If the issue still persists , a physical diagnostic is necessary to determine the exact defective part on your device. It could be a problem of main board or even worse, the panel.
You only have 3 modules in the back of that unit, the wifi and the sound master board and the video board. Samsung knows they have a issue with some, there is a diagnostic mode that will help you to determine, I would contact tech support before I bought a 350.00 module just to confirm, however I think your on the right track
Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
Before going further; try a hard reset first. If it does not help you, replace the main digital board. 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; visit the site linked here.
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