Question Samsung QN75Q7FAMF- Troubleshooting black screen w/ sound.

Aug 12, 2021
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New member and new to troubleshooting LED TV’s.
Issue began with vertical and horizontal lines on the screen after remounting the TV. I cleaned both ends of the connection ribbon cables attached to the Tcon board with denatured alcohol on a Q-Tip and reenergized. The result was more vertical lines than before but the picture was clear. After hitting the home button on the remote and arrowing up, the screen went black with the lines still visible.
Sound is on. I can change channels and volume with remote but the home button makes no changes.
I performed a flashlight test and no image was noticeable behind the black screen. Backlighting appears to function properly. I re-cleaned the ribbon cables using contact cleaner on a Q-tip and noticed a change in the number of vertical lines but no other changes.
Any advise on what the next things to check would be appreciated. I’ve watched some YouTube videos on checking voltages at certain points but I could not identify those points on my model TV.
 
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