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That would be my first suggestion - the cables. If that didn't help, check the menus - do the menus show up properly or do they also have the lines? If the menu shows up correctly, then it is the main board. If not, start checking the voltages - first the vs and VA voltages on the power supply and make sure they match the voltages on the sticker inside the case
With a multimeter, if you have one. If not, or if you are not familiar with doing this, then I would not suggest doing it yourself since the voltages in the TV are potentially lethal.
Sorry. I had an internet outage for a few days. It is finally fixed.
I would take a look at this video which shows you how to test the voltages on a Samsung. If you haven any doubt, don't do it. The voltage and currents are very high.