Question Samsung UN65NU6070FXZA has no picture!

Feb 29, 2020
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Good evening everyone,
I am not sure if this is the right forum to post in so if it's not feel free to let me know.
I recently picked up a 65 inch Samsung TV for free from Facebook marketplace. It was free because the owner of the TV said it didn't work. Of course I assumed that I could fix it rather easily and picked up the TV. After bringing it home I plugged it in and realized that it appeared that the backlight turned on but it wouldn't show picture. The only thing that shows up is a faint grey screen and the audio works perfect. I replaced the main board and the power supply board and then today I replaced the ribbon cables. Please let me know what I'm missing I'd love to get this TV working.
Thanks!
Joel

Samsung UN65NU6070FXZA

PS: the following are pictures of the TV
https://postimg.cc/gallery/1go1fc0ps/
 

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